GT Pony
Well-Known Member
- Joined
- Mar 13, 2015
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- 2015 GT Premium, Black w/Saddle, 19s, NAV
Except for the oil inside the journal bearings due to it heating up as it's squeezed and sheared. The reason the HTHS test was invented is to rate oil at 150C which is the temperature oil can rise to in journal bearings. The HTHS parameter gives an indication of how robust the oil will be inside the bearings under use conditions. So as Dr. Dmitri Kopeliovich from SubTech mentioned, max MOTF (which is also related to HTHS viscosity) is the main goal to keep bearings safe as possible.At 100C is where most of the oil will spend it's time even at high RPM ...
As pointed out earlier, Roush says 5W-50 is required at all times to maintain their engine warranty with their supercharger. And Roush collaborates with Ford Performance Racing, so if there was any real engineering reason not to use 5W-50 in a Coyote because it could do harm, then there would be no way Rouch say 5W-50 was required for their warranty to be in effect.Roush is NOT Ford Performance. They may differ in their ways of doing things, level of testing and invovlment of Ford OE engineers and what they believe is necessary, have tested etc.
Didn't the S197 Track Pack cars have the water-to-oil cooler? So they were specifying 5W-50 on an engine that also had an oil cooler.S197 track packs may call for 5W-50 to compensate for product cost limits. So 5W-50 is a compromise for the limits of a water to oil cooler under track use at the expense of greater cold start wear rates.
5 microns can make a difference. The MOFT isn't much, so 5 microns out of 20 or 25 to start with can make a difference.Come on guys...5 micro-inches (12.5 microns)...that's about 1/3 the width of a human hair (40 microns) and we're sitting here arguing about how 5W-30 is going to provide more protection over 5W-20...doh!
I'm just adding technical info and giving my viewpoint ... not trying to argue.Alright, I"m done. I"ve made my case. GT Pony his and Angry50 his meaningless and non-helpful rants against my posting too much. Now we can all just be friends. Peace.
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