can I use 0w-20 oil for lexus RX350 2007 for 10,000 mile oil change ?

 

Use what the vehicle calls for.

 

The recommended oil type is 5w-30. Not sure if you will run into any issues with another oil type but I have not heard of any sludging issue with 2nd generation RXs

 

Lexus thinks it is okay to run 0W-20 in a 2007 RX350 , see the attached chart in post 7 of this thread:

https://www.clublexus.com/forums/rx-...pe-thanks.html

As for a 10,000 mile oil change interval, I would want to see some used oil analysis that supports going that long

 

You need to learn the basic meaning of engine oil designations. When you look at the oil designation, (i.e., 10W30) the numbers refer to the viscosity (how thick) the oil is. The lower the number, the "thinner" the oil is. The first of the 2 numbers represents the viscosity when it is cold. The second number represents the viscosity when the oil is hot. Pure non-adulterated oil gets thinner as it gets hot, but through the miracle of chemistry, this has been changed.

You want a thin oil in colder climates. If you had a 30 weight oil and tried to start your car in below zero temperatures, the engine would barely crank over and not start. For hot conditions, you want a thicker oil that isn't like water so that the moving parts, especially the crankshaft parts that pound on each other, get the protective coating that is needed.

Maybe you have heard of a place like Texas where the summer temperatures are 110ē F. Put that 0W20 oil in your car and try to go visit the Grand Canyon in Arizona. I hope 2 things: 1) that you get there. 2) that you can afford a new engine.

 

I would use 0W-30 for 07

 

If you are saying multi-weight oils do not get thinner as temperature increases, that is not correct.

 

I'm not saying that. Today's oil still thins with temperature, but nowhere near what the old non-treated straight weight oils would. Multi-weight oils are very controlled in their expansion in order to function as a thinner oil when cold while still having the body of a thicker oil when hot.


I would be very concerned about using 0W anything in the summer, especially in the hotter southern climates.

 

I have been using full synthetic for the past 20K miles (113K miles total on the car). I believe it is 5w30 Mobil 1 - and have been changing every 10K miles ~ approximately 7 months.

 

When you start the car, the engine (and oil) is not at 100ēC. So until the engine and the oil warm up, the oil is functioning at the cold rating. I don't want 0W in my engine in summertime for the couple of minutes it takes to warm up.

 

In my climate, very cold is -4ēC and that is only a couple times a year. Yesterday the high temperature was 26ēC. By July we will be flirting with 40ēC. For morning starts you don't want water circulating in your engine.

And yes, I ran 50 weight oil in my dragsters.

 

This link might help.

https://www.bobistheoilguy.com/motor-oil-102/