Jontay

The owners manual states that I should use SAE 5W-30 Motor Oil (I live in S.W. Idaho). I have always used Castrol GTX 10W-40 in just about all of my previous cars. I always felt that a higher viscosity oil (10W-40) would provide a better lubrication and not break down as fast as a lighter oil would.

The car had one previous owner and it has 120k miles on it. The previous owner probably 'went by the book' and put in the recommended 5W-30 (I am assuming).

Does anyone know if I would be worse off or better if I use 10W-40?

Thanks for all the input.

PFB

What you are basically asking is the following:

Is it a good idea to ignore Lexus Engineers' recommendations, and follow my own instead?

The answer should be obvious.

DRACO A5OG

Stick with 5w30, car is engineered to run cooler so it needs the 5w30 weight anything thicker may be harder on the moving components when cold.

But I must default to:

It's your car now, do what the heck you want.

88Legend

Use 5w-30. The bearings and cylinders in the engine are designed for a certain viscosity oil.

Use should only use 10w-40 in these cars when your valve seals or rings are worn to reduce oil consumption. You will not have to worry about that until like 300k miles though.

jrryjms07

^^ agree with' em

but i always used mobile 1 synthetic on my previous cars.

Jontay

thanks for all of the replies. Love these forums. Nice to have a resource of info when you venture into something new. Thanks again to everyone for taking time to respond.
5W-30 it is!

NSBRO

Follow the Manufacturers recommedations