@ArgonBlue - Sure, good question, and I'm happy to answer it.



When that picture (image above) was taken on 12/6/2024 it was 49° outside as noted. It just so happens I had recently tweaked (adjusted) the air pressure for my tires based on the upcoming colder winter weather. FYI, I like to shoot for 36 - 37 psi all around (all 4 tires) at a temperature of 72°. I always prefer to be a little over inflated versus underinflated. I never like seeing under 35psi. As I'm sure you know, for every 10° ambient temperature change the tire's air pressure drops or increases about 1 psi. Radiation from the sun increases the air pressure, and driving also increases the air pressure as well.

As I distinctly recall, at the time I tweaked my tire pressure it was about 72° in the garage but about 50° outside that day. I purposely inflated my tires to exactly 40 psi that day knowing that it equated to about 38 psi (a drop of ~2psi) at the [then] current outside temperature of 50°. And, knowing that when the temperature drops to a typical 32° to 42° in my area this winter, my tweaked 40 psi will drop about 3 psi - 4 psi down to my preferred 36 - 37 psi - - which is exactly what has happened recently!

I use a really neat little air compressor to tweak the air pressure for my vehicles' tires.

This morning (January 15th) at almost 8 am here in Dallas, Texas it is currently 35° outside. My tires are tweaked perfectly to my preferred pressure!

Will the air pressure in my tires go up and down as the outside temperature changes? Sure it will, but it will be within a range I like. The temperature here might get down to the upper teens or get up to 70°, but it's in a range I can live with...

Hopefully this answers your question.

 

Nice, yeah that definitely explains it. I’ve always just adjusted the tire pressure a couple times of year when the temp changes and kept them at recommended pressure, but it’s an interesting idea.

 

I am more interested and concerned with upcoming colder outside temperatures as winter approaches than I am with upcoming warmer outside temperatures when summer approaches. The reason why is because colder temperatures decrease tire air pressure, and since an underinflated condition is viewed as more concerning and relevant regarding tire wear and safety, whereas an overinflated condition is far less of a concern.

I think it's fair to say it takes more time and effort for most people to increase tire pressure than it does to decrease tire pressure. That is specifically why I am more interested and concerned with upcoming colder outside temperatures as winter approaches than I am with upcoming warmer outside temperatures when summer approaches...

I have attached a Lexus Tire Pressure Compensation and Adjustment Technical Information Bulletin which may provide some added help...

 

This thread titled ' Oil Change Interval' has changed topics from being about engine oil changes to about tire air pressure. No big deal here mind you, but some people are surely expecting posts in this thread to be about engine lubrication instead of tire air pressure.

It's about time we get back on topic...

 

Factory recommends 10k for 0-20 synthetic
Some change at 5k some change at 10-20k,

I have never seen an engine blow up because they missed oil change interval at 10k

 

Engine guarantee--Mobil 1 Annual Protection limited warranty provides a guarantee of performance and protection for one year or 20,000 miles between oil changes, whichever comes first.

 

deleted, new thread started

 

I said it a few times in diff threads. If you plan to keep, and/or have a 100k plus car, do change the oil at 5k - 6.5k intervals max. The 2GR like many engines are subject to Ring & Cylinder problems with the long oil changes. Need only to look in the IS350 and 3rd Gen GS350 forums, to see how many engines that use very excessive oil at higher miles due to extended oil changes. Want to burn a Quart of oil every week or two?

If you bought it new or with very low miles. Plan to trade it at 100k, then ok, 10k will not be your problem later on. All fluids are subject to contamination. Yes it's your car so treat it how ever you want, or not.

https://www.clublexus.com/forums/gs-4th-gen-2013-2020/1032050-replacing-engine-what-should-should-i-get-replaced.html

https://www.clublexus.com/forums/gs-3rd-gen-2006-2011/963433-2010-gs350-engine-oil-consumption-burning.html

 

@ArgonBlue - This morning (1/21/2025) I went out for breakfast and parked outside at 25° (as noted at 7:00am). As you can see, I got exactly the preferred tire air pressure I like to have during the winter season - perfectly tweaked at 36 - 37 psi.

 

It's been crazy cold this past few days and -3* this morning in Chicago. My tires are generally 35 to 37PSI. This morning it was 31 and 32PSI.

 

Yeah, I never want to see my tire pressure get below 35 psi.