Thought I'd bring this over here for some more oil-oriented discussion, though I'm hardly knowledgeable enough about the mechanics of Fords VCT and their cam phaser design, nor oil viscosity and how that may affect things like VTC feed pressure etc etc. So yea, I'm just being a knowledge sponge here LOL My experience- I purchased the 2018 EB 3.5 2k demo truck with one oil change already done by the dealer at around 1.7-2 k miles. I'd never noticed the cam phaser noise* (presumably per the F150 forums and pertaining to the Gen 2 engine '15-19, though it is hottly debated just what the heck is causing the noise !) until I changed the oil at 7k miles. Went from whatever they had in it, presumably Motorcraft semisyn 5w-30, to PUP 5w-30. Very shortly thereafter I noticed cold engine clatter of indexing phasers, or whatever. After reading here about LSPI preventive formulations, SN+ and calcium levels (and those of 2018 bottled PUP) and the new B1 spec by Ford, within a few hundred miles I decided to dump the PUP and change to RGT 5w-30. With that change I noticed a pronounced decrease in rattle intensity, though still there and reproducible under the right cold engine conditions. But definitely better than with PUP. And it always goes away within say 5-10 minutes of starting and never happens warm or hot. Worse on easy low gear acceleration, but present on deceleration as well. If interested, here's the biggest thread about this noise, though there are several going right now. https:/
/ Shortly into the thread there is a video demonstrating the noise, though it seems to be variable in intensity from one truck to the next. Nothing has seemed to change much over the years, and if it's a design flaw, Ford isn't acknowledging it nor has a reliable fix when they somewhat do.... such as changing the cam phasers and timing chains and tensioners... WTH?
Question to the BITOG group is, do any of you have insight into viscosity and how it plays into specifically the Ford CVT system?
Is the cSt 40? ( darned near start up temps here in Florida ) difference between MC semi and PUP and RTG enough to affect VCT phaser performance? Word is, again on the F150 forum, it is a VCT and possibly it's cleaning cycle that is causing the noise. But why does it have to be noisy? And if I wanted to clean something, I'd get it warm first and not try to do it cold!!
I've read how Hondas VVT for example may have issues with higher than spec weight oils, but my change from PUP to RGT seems to have helped, not hurt.
Might I be looking to say a 10w-30 for example?? A rare F150 member said going to an 0w helped their noise fwiw, though my experience (going thicker) thus far is the opposite.
Thoughts from those more in the know than I?? (and that's easy !)
TIA www.f150forum.com/ f118/ 17-3-5-ecoboost-rattle-401441/