I brought my 330 to the dealer for an oil change and trans. software update. Supposedly they rotated the tire, etc... I went to check the tire pressure and noticed all 4 tires were at 40 psi? Is that too high? This is my first SUV, I know that for cars you would usually pump the tires to 32 psi and be good to go. Is the 32 psi not the norm for SUV/light trucks?

 

There was a discussion about this recently:...
https://www.clublexus.com/forums/sho...d.php?t=158416

 

The White Sticker inside the drivers door has the specs. Always check in the morning with the tires cold. Additionally, I've found up to four psi difference between stick type tire guages. Sears sells a good "Accutire" digital guage that reads in one half psi increments. They warranty the unit in auto or craftsman tool section. Mine cost $16.99 Retail.

 

It's a black label for 2004 and newer Lexus and Toyota models.

 

I think recommended is 30 psi and some people have been running them at 35 psi.

 

cuz customers dont monitor their tire pressure. if left at 32 psi when the cust does come back. its going to be less than 30 witch will cause abnormal tire wear
as for leaving it at 40. i havent seen any t abnormal tire wear yet.
and u get slightly better gas milage when u have higher tire pressures

 

The back page of your owner's manual will say 30 lbs. all the way around. Since there is usually some loss of pressure over time especially during cold spells then 32 lbs. would be fine. There is quite a difference in ride quality at 40 lbs. even though fuel efficiency will probably improve. My techs like to leave at least 35 and I usually see about 38 after the PDI (Pre Delivery Inspection). The cars are shipped with over 50 lbs to keep the tires round and free from flat spots so the techs bleed them during the PDI. What ever pressure you decide is best for you is a personal preference. Just keep them all the same so the tires are all acting in unison. Rotation every 5,000 miles is recommended and we like to rebalance each rim/tire again before repositioning. Another thread was jettisoning the spare and tools for weight savings. I have changed a flat to the spare twice on my wife's RX300. It was not that easy. I have a extra metal tube or pipe that I have to slide over the standard lug wrench to gain enough leverage to overcome the tightness left from the impact gun that the techs use to zip the lugs on with. Since you have an alloy wheel pressed against the steel hub it will sometimes fuse together and require quite a robust kick or rubber sledge to dislodge. The rest is easy after that. Whew!

 

On my RX300, I have 235-70-16 with max pressure of 44. I use nitrogen in my tires.

After much experimentation, I settled on 38 psi.

 

Since good old air is 80% Nitrogen anyway then I'm curious as to your perceived benefit? Nitrous oxide would be useful if you had to change a tire....When they built the Montreal Metro system they used tires on the trains because they were quiet. For some reason they used Hydrogen for inflation. This caused a severe fire and the tunnel had to be filled up with water to put it out. They switched to Helium after that with no problems. Get lighter unsprung weight with Helium, yeah that's the ticket....

 

Interestingly enough, checking my 2004, the recomended tire pressure is listed on the black VIN plate as well as a white infomation secondary sticker in the door jam. Both call for 30 PSI cold. I just thought it was funny since Tammy and flipside were both technically right

 

i agree. like what he said. and i might add. how many as lexus owners do check the tire pressure often. i know i dont.

 

Interstingly the rx400h needs 32 for front tires and 30 for the rear tires.

 

I do 33 front and 30 rear. Gives the tires a "balanced" look (the front tires no longer look flat compared to the rear ones.) Also seems to handle and ride better.