Should I switch from 10w30 to 5w20? Switch to High Mileage Oil?

[kschachn]

Thank you for explaining it this way. I read somewhere that the Ford engineers said Xw40 or Xw50 weight is too heavy for the lifters on this engine but 10w30 is fine. I don't drive like a maniac. The way I drive, the RPM rarely goes above 1500. Sometimes when there's no traffic at night I floor it for a few seconds just to clean out crud. (That always gets my heart racing!)

I'm going to stay with the 10w30. Like others have said, it's done a great job so far, and I'd like to put off a timing chain replacement as long as possible.

Thank you, everyone!

If you read that somewhere it was not from a Ford engineer. Or else it was an engineer that had no idea what he or she was talking about.

If it were true imagine the carnage that results from anything but a hot start.

 

[ZeeOSix]

If you read that somewhere it was not from a Ford engineer. Or else it was an engineer that had no idea what he or she was talking about.

If it were true imagine the carnage that results from anything but a hot start.

The dealerships and shops would be backed up every spring with millions of blown-up engines from starting up and running with cold oil at 5,000 cSt.