Quote:
Originally Posted by rmay635703
Also What oil are you using? When the local Lube place changed my oil last winter they put in normal 10w30 non-synthetic despite my providing 5-30 synthetic. My mileage dropped at least 6mpg after that and bounced right back when I put in the proper oil a bit early (I couldn't top 50mpg after that oil change which really burned me up).
|
All manufacturers are switching to lighter engine and gearbox oils for FE reasons.
Especially in winter, when cranking a very cold engine into life, you're FE is going to take a hit when switching to a heavier oil.