Quote Originally Posted by Merc View Post
Both Toyota and Honda specify 0W20 synthetic oil in their cars and changing it every 10,000 miles. I don’t know when that started but I’m sure the type and weight of the oil has something to do with engine longevity we’re hearing about.
It is mainly for improved gas mileage (less drag on the crank and oil pump). When I bought my wife's 2004 Grand Marquis the 0W-20W was recommended but when used it was so thin the lifters would rattle when first started. I used it though till it was out of warranty then went to a thicker grade synthetic. I target for changing the oil @ 3000 miles but always miss it. I try not to go over 5000 miles regardless.