Help finding Ford Service Bulletin

[Maxpowers]

This is not meant to be a debate thread. I fully understand the differences in weights of oil.

I know I saw a Technical Service Bulletin somewhere on this site that said all 4.6 motors should be swtiched to the 5w-20 weight oil due to lack of oil flow to the heads.

Can someone please link it in here?

 

[N8Dogg98]

This is not meant to be a debate thread. I fully understand the differences in weights of oil.

I know I saw a Technical Service Bulletin somewhere on this site that said all 4.6 motors should be swtiched to the 5w-20 weight oil due to lack of oil flow to the heads.

Can someone please link it in here?

It makes sense to me. Extended high RPM operation can starve the oil pan if you don't have sufficient drain back at times resulting in spun bearings.

Unfortunately I don't know where the TSB is, but I do know that at some point they changed the oil requirements for all of the 4.6 cars to 5W 20. The engines were basically the same, therefore it certainly wouldn't hurt to run 5W 20.

 

[Kilgore Trout]

The change in weight was due to fuel economy improvements ONLY.

 

[Maxpowers]

The change in weight was due to fuel economy improvements ONLY.

I agree this may be the underlying reason, but I am 100% sure I read a service bulletin on this site stating to change it for lack of oil flow to the heads.