As for going to a 5w-30 that could be bad on your bearings but then again whats it matter once warranty is out the window not much Ford can say. Ive just been told the tolerances are too tight on the newer Ford motors to run a thicker oil.
No it doesnt seem to get much louder, stays the same for the most part. Maybe a lil bit louder. The video seems to work not sure if something is up there. As for the lifters im not exactly sure what your talking about because to my knowledge all there is, is a follower, cam and valve. Also i didnt think you could just replace the guide, thought you had to replace the whole head. As for going to a 5w-30 that could be bad on your bearings but then again whats it matter once warranty is out the window not much Ford can say. Ive just been told the tolerances are too tight on the newer Ford motors to run a thicker oil.