Driving a 2001 Toyota Corolla, 1.8l auto. Vehicle has 225,000 miles and is driven in Southern California. Mostly freeway, but definitely some city driving.
Would there be any benefit to moving away from Toyota’s recommended oil weight? I have browsed the discussions and it seems there are a number of posters who insist on never varying from the Owner’s Manual. Okay. I appreciate that thought.
BUT. I’m still curious about how thick I should go given that it’s getting warmer in an already warm area, the car IS burning a bit of oil. (about a quart every three months) and I’d like to use knowledge and experience to make a decision since circumstances alter cases. 5W-30 seems fine for a catch all soultion. But it assumes ALL weather on a new vehicle, so… wouldn’t those in warmer climes benefit from moving to 10-30 in most every case? Wouldn’t higher vicosity be preferrable considering the mileage on the engine? BUT, would moving to 10-40 cause sludge or fail to flow as desired in a high-tolerance engine such as this (or as it was when it was new.) How about 20-50 even? Straight 30 or 40 weight?