Good bye Shell Rotella
Unless I'm missing something...After using Shell Rotella oil's since the early 80's I just returned a case of Rotella of T-6 full synthetic for a case of Motorcraft oil for my 6.7 Powerstroke. Seems ...
Forum Discussion
jus2shy wrote:
OK, I'm not understanding their methodology for measuring wear in the valve train on the cams, or what constitutes a failed cam in the video. I see discoloration on the 2 cams when they had them side by side. Also, 50% increase in wear... how did they arrive at that number? Dimension measuring? or PPM in the oil? I do know that Ford has expressed concern due to their lifter material wearing faster, but that was done through dimensional analysis of the lifters and it wasn't meeting their planned 250k mile design life for their engine. At least Ford was specific in talking about the wear issues with their valve train and methodology none the less. Even Chevron will have to wait to meet Ford's standards Chevron letter of position
Oh well, I know I'm going to buy some Valvoline extreme premium blue 5w40 for my next change. It makes Ford's and Cummin's list of approved oils @ 5W-40.
J2S,
You're a wise man...
As for your excellent questions the language in the video leads me to believe they measured the lobes probably both dimensionally and surface roughness to get a quantifiable result. Having said that , some oil companies (i.e. Delo but not limited to) make videos utilizing visual inspection (non-quantifiable) of engine parts after X amount of miles to praise their oils performance.
