Ford now uses a thinner 5w20 oil in my new 2010 Ford Focus,(and most other Ford models) but a google search of 5w20 oil --reveals that many believe Ford did this to increase their CAFE (Corporate Average Fuel Economy) because the thinner 5w20 oil increases gas mileage---at the expense of longer engine life. Now, my Ford dealer tells me it is because of smaller engine tolerances, but when I confronted him directly with this issue, he told me it was ok to use the usual 5w30 oil, and that it would not devoid the warranty. Just what is the real story here? How safe is 5w20 for my new car? And should I switch to 5w30 or not?? Oil is such a critical issue in a car, and I want what is best for the life of my new engine? Thanks!
Why has Ford switched to 5w20 motor oil? Is it as protective as 5w30?
- Thread starter Alan
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