Originally Posted By: BIMMA
I have a 2007 Lexus ES350, with 76000 easy driven miles.
Since 55000 miles I use Amsoil Signature 0-30, but now I would like to switch to M1 0-20 AFE.
Is that a good idea? If not, which is the best oil for this engine?
Thanks.
Originally Posted By: Trav
Don't bother going to an xw20 anything, even if its back spec'd its for Toyota's benefit only not your engines. A good 5w30 0w40 works well with these engines.
OP said that "easy driven miles", I took this as the engine rarely see 5-6k RPM and highway speed is probably no more than 85-90 MPH and engine speed is probably no more than 2.5-3.0k RPM. Then the oil temperature is probably never above 200-210F, and since Toyota back-spec to xW20 then it will be sufficient.
I am using xW20 in my E430 instead of M1 0W40 for about 7-8 years already, the engine is running very smooth and no oil consumption at all. The reason I use xW20 is this car is it rarely sees RPM above 2600-2800, so I think oil temp is probably no higher than 200F, the coolant temp is actually lower with xW20 at 82-85F instead of 88-90F on highway at around 80-85 MPH.