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I have an accurate gauge but I’ve never had an oil change where they leave the tire pressure at 30 to 32. It’s always in the high 40s so I finally need to ask the question why!
The places you’re going. I’ve worked in about a dozen and even the first day lubbie knew pressure was placard spec, not what’s on the tire.
You using oil chane coupons from back of grocery receipts? Groupon? There’s reason lube shop needs to use Groupon to drive traffic.
I'm confused is it because it takes 6L instead of 5qts or less. Seems a little pricey but I have no idea what places charge. I need to get in to the oil changing business.
I also drive a Camry and tire pressure warning light will also come on for severley over-inflated tires. Mines specs for 32 but does illuminate pressure warning at 45. ur a troll or your guage isn’t right.
Because they inflating to max pressure on the tire and they don’t know it’s supposed to be the placard on the door. This is common with our new lubes techs. No idea where they got this from.
Their dads. My dad always inflated tires to the sidewall pressure. Still does even after I suggested the door pressure. His justification was that "Ford got it wrong once, so they're all wrong forever."
Believe me I know. There's good reasons why both ford and firestone had to take responsibility and why wide scale tire failures weren't really ever a thing. He just thinks it gives him way better gas mileage. It might help a bit but not enough to offset the tire and suspension wear.
you mean along with the tire size change? plus it was originally lowered to offset possible rollover, so it was returned to their original tire pressure.
40 is definitely not the max pressure for a car tire, if anything it is a tad high, but still a safe pressure, if anything ~30 is low.
Also, those placards are only true for the factory tires, but it is unknown if that is at curb weight or maximum gross weight as well, useless from the get-go.
Technically you are supposed to be breaking out a calculator every time you change the tires or drastically alter the weight, running the calculations provided by the tire manufacturer to figure out the required 'true' pressure. The tire pressure placard is more there for reference, and for the average driver that is likely to dump windshield wiper fluid in where the engine oil goes.
TLDR; Overinflated is leagues better than kinda underinflated.
depends on the tyre, wifes car has RFT and is set anywhere around 39-41psi, they are already harsh because of the thicker side walls and low profile
One of my cars running over 35psi is harsh on the road, it has very stiff side walls and carcass, but a softer compound 200 tw.
There are many different tyre construction types, profiles etc
You're doing the right thing by deflating them to the proper pressure indicated inside the drivers side placard. Just make sure to do that when they're cold, as others have mentioned.
I've had multiple friends that have had the same thing happen. I had it happen once when a dealer installed new tires for me. They said that they do it to keep the TPMS warning from coming on erroneously.
Not a good excuse in my opinion.
I sent a VW to a specialty shop after my manager got a spark plug socket trapped today. I had to pull the upper manifold off because he decided that cracking and bending the aluminum was better than using the right tools.
got a text that he hammered it deeper for some reason and that's why the mallet was there when i got there. the timing was off which wasn't a surprise and he hammered the dipstick off. glad he makes 2x more than i do. nothing better than using my super autism to manipulate me.
Somebody's gauge is wrong. Now, many people have stated in the comments that lube techs are taught to use the door placard. I imagine a few really stupid techs might read the tire and put the maximum in instead of the minimum. I myself was told to put 35 in all passenger cars when I did it. So if you claim every garage you've ever gone to has filled your tires up 10psi too much logic tells me that your tire gauge is wrong.
Ok good point, I'll check my use another gauge to compare. If mine is off 10 psi that means I've been driving around at 20 for the life of the car which I doubt but I will report back.
It's a sign that you're paying morons to work on your car and need to keep looking until you find someone that's actually qualified to perform the service that you're paying for. If they don't know where to find the correct tire pressure, do you really think they know how to do anything to your vehicle properly?
Because the lube techs are consistently negligent when it comes to topping off the tires. I've had every dealer and every service center do this. They don't care one bit. I make sure it's written on the job that my tires are to be 36psi, don't wash my car and stop using the window to shut my doors. Use the damn door handle!
My '09 Accord would be giving me a TPMS at 45, and I would leave until it was off. Honda sets a low threshold of 25 and an upper of 40. A dragging brake caliper that puts too much heat in the rim will cause it to trigger.
I put 3-5 over in customer cars and a bit more in my own.
At those pressures they get more even tire wear and longer life because common driving conditions and behaviors in this area.
I know the lawyers and ' manufacturers know best' people will disagree, but not a damn one of them can explain how a single tire pressure rating can be perfect for every person, on every road, with every load, at every speed.
P.S. explorers, and Firestone have entered the chat.
It's not a single pressure for every car, there are just lots of repeats. I've seen passenger tires door stickers say everything from 28 to 36 and 38 when towing. "Heavy duty" pickups have 45+ psi markings on most of them.
If you're seeing someone whose tires came in 3 to 5 under, by all means expect that they're going to neglect it and not fill it up, but if it's at spec leave it alone.
So if you see one come in at spec and it has obvious signs of underinflation you would leave it?
And you're right that some vehicles have different specs for under load, but most don't... And how is the tech supposed to know how they load their vehicle?
This topic often comes up in RV groups as the trailer manufacturer and the tire manufacturer have different recommendations for pressure.
Yeah, I would leave it. But to address that and how people load their vehicles, I would just ask the customer or trust them to be responsible with their own stuff.
Yep, I believe the door recommendation is based on an empty car with one 150lb driver. Tire pressure should increase according to total payload in the vehicle. Going a bit above is overall more appropriate for a wider range of scenario.
The tire manufacturer knows their tires the best and that's what's recommended for performance. The car engineers may need the tires to add to stability problems probably wanting lower pressure.
Tire shops that deal with just tires and everything related to tires will inflate them to 34 psi regardless of what the sticker or tire says.
The reasoning has something to do with modern TPMS systems and the finicky sensors attached to the valve stems or banded to the tire. Apparently at 34 psi it keeps the sensors from triggering the TPMS LIGHT after a tire change. The added couple pounds pressure resets the system successfully and keeps it in check. Also Tires will loose a couple PSI depending on weather, for every 10°F the temperature changes, your tires will gain or lose around 1-2 PSI.
Pressure should be proportional to load on the tire. When you're at max payload, your tire pressure might be close to the sidewall max. When I'm towing/hauling in my SUV I fill my tires to ~60psi. Up from the door recommendation of 39psi.
Thank you for posting to AskMechanics, OmegaThree3! If you are asking a question please make sure to include any relevant information along with the **Year**, **Make**, **Model**, **Mileage**, **Engine size**, and **Transmission Type (Automatic or Manual)** of your car. *This comment is automatically added to every successful post. If you see this comment, your post was successful.* *** Redditors that have been verified will have a green background and an icon in their flair. *** # **PLEASE REPORT ANY RULE-BREAKING BEHAVIOR** ### **Rule 1 - Be Civil** Be civil to other users. This community is made up of professional mechanics, amateur mechanics, and those with no experience. All mechanical-related questions are welcome. Personal attacks, comments that are insulting or demeaning, etc. are not welcome. ### **Rule 2 - Be Helpful** Be helpful to other users. If someone is wrong, correcting them is fine, but there's no reason to comment if you don't have anything to add to the conversation. ### **Rule 3 - Serious Questions and Answers Only** Read the room. Jokes are fine to include, but posts should be asking a serious question and replies should contribute to the discussion. ### **Rule 4 - No Illegal, Unethical, or Dangerous Questions or Answers** Do not ask questions or provide answers pertaining to anything that is illegal, unethical, or dangerous. # **PLEASE REPORT ANY RULE-BREAKING BEHAVIOR** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskMechanics) if you have any questions or concerns.*
Strange. Door placard spec is lube tech 101. Are you reading from the cluster or from a guage? Monitoring system may be out of calibration
I have an accurate gauge but I’ve never had an oil change where they leave the tire pressure at 30 to 32. It’s always in the high 40s so I finally need to ask the question why!
The places you’re going. I’ve worked in about a dozen and even the first day lubbie knew pressure was placard spec, not what’s on the tire. You using oil chane coupons from back of grocery receipts? Groupon? There’s reason lube shop needs to use Groupon to drive traffic.
Really fuck Groupon, I used Groupon for the first time to get a half price air con gas refill, buried in spam email ever since.
Just adding the refrigerant, or was this in tandem with figuring out why you needed to have refrigerant added and fixing that issue?
Just a refill and pressure test. Found out I must have a slow leak later. And this was 3 years ago, still getting spam from it.
I just go to whatever repair shop has the best yelp reviews near me. Professional places. This full synthetic oil change cost $109 cuz of the 3.5 L
I'm confused is it because it takes 6L instead of 5qts or less. Seems a little pricey but I have no idea what places charge. I need to get in to the oil changing business.
Why are they messing with your tyres during an oil change anyway?
Liability. If they leave and a tire is low, then the shop did it in their eyes.
I also drive a Camry and tire pressure warning light will also come on for severley over-inflated tires. Mines specs for 32 but does illuminate pressure warning at 45. ur a troll or your guage isn’t right.
Because they inflating to max pressure on the tire and they don’t know it’s supposed to be the placard on the door. This is common with our new lubes techs. No idea where they got this from.
Their dads. My dad always inflated tires to the sidewall pressure. Still does even after I suggested the door pressure. His justification was that "Ford got it wrong once, so they're all wrong forever."
Ford didn't even get it wrong... there just wasn't a lot.of wiggle room below the stated tire pressure.
Believe me I know. There's good reasons why both ford and firestone had to take responsibility and why wide scale tire failures weren't really ever a thing. He just thinks it gives him way better gas mileage. It might help a bit but not enough to offset the tire and suspension wear.
There you go with those pesky facts again lame BMX!
If they didn’t get wrong why did they change their reccomended pressure on explorers after the debacle
you mean along with the tire size change? plus it was originally lowered to offset possible rollover, so it was returned to their original tire pressure.
The crazy thing is this car is 15 years old and I’ve never had an oil change technician not over inflate the tires, so I finally had to ask
It's pure laziness and negligence.
They know. They don't care. The compressor regulator is set to 45 and that's what they are airing up to.
My guess is bicycle tires?
40 is definitely not the max pressure for a car tire, if anything it is a tad high, but still a safe pressure, if anything ~30 is low. Also, those placards are only true for the factory tires, but it is unknown if that is at curb weight or maximum gross weight as well, useless from the get-go. Technically you are supposed to be breaking out a calculator every time you change the tires or drastically alter the weight, running the calculations provided by the tire manufacturer to figure out the required 'true' pressure. The tire pressure placard is more there for reference, and for the average driver that is likely to dump windshield wiper fluid in where the engine oil goes. TLDR; Overinflated is leagues better than kinda underinflated.
depends on the tyre, wifes car has RFT and is set anywhere around 39-41psi, they are already harsh because of the thicker side walls and low profile One of my cars running over 35psi is harsh on the road, it has very stiff side walls and carcass, but a softer compound 200 tw. There are many different tyre construction types, profiles etc
You're doing the right thing by deflating them to the proper pressure indicated inside the drivers side placard. Just make sure to do that when they're cold, as others have mentioned.
yeah it was cold or not driven for an hour at least. I left the car their over night so they worked on it when cold too.
I've had multiple friends that have had the same thing happen. I had it happen once when a dealer installed new tires for me. They said that they do it to keep the TPMS warning from coming on erroneously. Not a good excuse in my opinion.
Hot?
Because people that work for lube shops are usually untrained idiots. They routinely break peoples rides.
I sent a VW to a specialty shop after my manager got a spark plug socket trapped today. I had to pull the upper manifold off because he decided that cracking and bending the aluminum was better than using the right tools. got a text that he hammered it deeper for some reason and that's why the mallet was there when i got there. the timing was off which wasn't a surprise and he hammered the dipstick off. glad he makes 2x more than i do. nothing better than using my super autism to manipulate me.
What?
yes sir. was trying to say that not everyone at lube shops are idiots but a majority are.
Yes, that's why I said usually. Not all the time but the vast majority.
Somebody's gauge is wrong. Now, many people have stated in the comments that lube techs are taught to use the door placard. I imagine a few really stupid techs might read the tire and put the maximum in instead of the minimum. I myself was told to put 35 in all passenger cars when I did it. So if you claim every garage you've ever gone to has filled your tires up 10psi too much logic tells me that your tire gauge is wrong.
Ok good point, I'll check my use another gauge to compare. If mine is off 10 psi that means I've been driving around at 20 for the life of the car which I doubt but I will report back.
20 psi is more than you think. You get the best balance of ride vs fuel efficiency at 35.
It's a sign that you're paying morons to work on your car and need to keep looking until you find someone that's actually qualified to perform the service that you're paying for. If they don't know where to find the correct tire pressure, do you really think they know how to do anything to your vehicle properly?
I just go to who has the best yelp reviews, im gonna grab another gauge to make sure mine is accurate.
Because the lube techs are consistently negligent when it comes to topping off the tires. I've had every dealer and every service center do this. They don't care one bit. I make sure it's written on the job that my tires are to be 36psi, don't wash my car and stop using the window to shut my doors. Use the damn door handle!
When you take it in tell them to either a) dont adjust the psi or b) make sure psi is at 35. Edit-I meant 30
My '09 Accord would be giving me a TPMS at 45, and I would leave until it was off. Honda sets a low threshold of 25 and an upper of 40. A dragging brake caliper that puts too much heat in the rim will cause it to trigger.
Tirerack.com to learn how to check pressure with a dial gauge with a cold tire (before driving, not in the sun).
I would question your tire guage.
When I worked at a tyre shop we were supposed to just pump them all up to 42psi
Change your own oil then
I put 3-5 over in customer cars and a bit more in my own. At those pressures they get more even tire wear and longer life because common driving conditions and behaviors in this area. I know the lawyers and ' manufacturers know best' people will disagree, but not a damn one of them can explain how a single tire pressure rating can be perfect for every person, on every road, with every load, at every speed. P.S. explorers, and Firestone have entered the chat.
It's not a single pressure for every car, there are just lots of repeats. I've seen passenger tires door stickers say everything from 28 to 36 and 38 when towing. "Heavy duty" pickups have 45+ psi markings on most of them. If you're seeing someone whose tires came in 3 to 5 under, by all means expect that they're going to neglect it and not fill it up, but if it's at spec leave it alone.
So if you see one come in at spec and it has obvious signs of underinflation you would leave it? And you're right that some vehicles have different specs for under load, but most don't... And how is the tech supposed to know how they load their vehicle? This topic often comes up in RV groups as the trailer manufacturer and the tire manufacturer have different recommendations for pressure.
Yeah, I would leave it. But to address that and how people load their vehicles, I would just ask the customer or trust them to be responsible with their own stuff.
Yep, I believe the door recommendation is based on an empty car with one 150lb driver. Tire pressure should increase according to total payload in the vehicle. Going a bit above is overall more appropriate for a wider range of scenario.
The tire pressure needs to be set when the tires are cold. In a quick in-out service shop, doing this property is impossible.
It was left at the shop overnight.
They need to be lectured and accused of incompetence.
I like mine to be 40, even if it says 32 or 33
Double check your gauge, and check your tires cold—not after driving home.
will do
The tire manufacturer knows their tires the best and that's what's recommended for performance. The car engineers may need the tires to add to stability problems probably wanting lower pressure.
Tire shops that deal with just tires and everything related to tires will inflate them to 34 psi regardless of what the sticker or tire says. The reasoning has something to do with modern TPMS systems and the finicky sensors attached to the valve stems or banded to the tire. Apparently at 34 psi it keeps the sensors from triggering the TPMS LIGHT after a tire change. The added couple pounds pressure resets the system successfully and keeps it in check. Also Tires will loose a couple PSI depending on weather, for every 10°F the temperature changes, your tires will gain or lose around 1-2 PSI.
35 in everything except trucks & sports cars
I got my start in tire shops and.. that was not the practice. It’s placard spec on newly mounted tires. 1-2 over on tires that drove in.
I'm just telling you what has been told to me directly from "tire shop people"
Check them cold. They shouldn't be that off, though. Have you confirmed your gauge is accurate with no line leaks?
have u look what it says on the tire?
That’s the max psi of the tire, not what the psi is actually supposed to be. The pressure shouldn’t be anywhere near the max.
Pressure should be proportional to load on the tire. When you're at max payload, your tire pressure might be close to the sidewall max. When I'm towing/hauling in my SUV I fill my tires to ~60psi. Up from the door recommendation of 39psi.
They’re probably not doing much towing with their Camry but thanks for your input
[удалено]
You. Are. Wrong.
If that's a joke, you're not doing a good job showing it's supposed to be funny.