Originally posted by ddmd3216:
am i damaging my engine, can i switch to 5 w 30 after using 10 w 30 guy at counter asked me how many miles and told me to use 10 w 30
I've been told this too, that older engines should use 10W30, but I don't think it's true unless your engine is genuinely wearing out. The bearing tolerances, if like new, are too small for 10W30. Some people here -- mainly duratec guys, I think, but still -- report noises in the engine when trying to use 10W30 that go away when switching back.
