I have a 99 F150 5.4 4x4 i have always used 5w30 motorcraft oil and filter guys i talk to say 5w30 is to light in summer and i should use 10w30 what to do?my truck calls for 5w30.

 

Haven't we been through this already? 5W30 is fine.

 

Yes thanks i just want to do what is best for my truck

 

^^^ X2 ^^^

You need to find some different 'guys'.

The oil world (and these engines) has changed. A LOT.

Please check out some of the myriad oil threads in this section ...good readin'

 

20W50 won't hurt it. Neither will JD Plus 50. Neither will 15W40. Neither will 10W40. Neither will 10W30. Neither will 5W30.

 

If you are using 5W30 Motorcraft oil and filter, that's what the factory recommends for your engine under all operating conditions and there's no reason to use anything different. You can if you want to though but I personally prefer to follow manufacturer's recommendations.

 

Good advise.

 

20W50 is too much. Sorry Chester.

 

Agreed, but it won't hurt it. I know people that run it year round.

 

Ditto... Run it on canola oil if it makes you sleep better at night. Sure there are other oils that will probably work just as well, but plain ol' 5W-30 is what the factory recommends for it. Unless your buddies know something about your engine that the powertrain engineers that designed, tested, and built it overlooked, I'd suggest sticking with the OEM recommended 5W30.

(FWIW, Ford has rated their 5W20 Synthetic Blend to replace just about every oil weight recommended since the mid-80s. There are a few exceptions, but the F-150 is not one of them)

-Joe

 

Do you mean i should use 5w20 or 5w30?

 

I'd just stick with the 5w30....

 

Either 5W-20 semi-synthetic or any brand/type of 5W-30.

 

Motorcraft 5w30 is a synthetic blend

 

*Some* motorcraft 5W-30 is synthetic blend. There are two different bottles. One is dino-oil, one is synthetic blend. To my knowledge all Motorcraft 5W-20 is synthetic blend.