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If you have a car which recommends 0W-20 from the manufacturer and we add a power adder to it (for sake of this discussion lets say a supercharger) does that warrant a change in oil viscosity? Obviously the bearing clearances don't change and the supercharger has its own oiling system, so it...

This is my first UOA done on my wife's car. The car has been running the Shell Rotella T Synthetic 5W-40 CI+ for the past 6 oil changes, each around 3500 miles. Currently trying out the CJ-4 formulation and will get another UOA when it comes out. The high fuel is likely due to pulling it out of...

I have been lurking on here for a while and getting to know the differences between dino and synthetic and the various groups that synthetic oil fall into. The way I understand it is that dino oils start out with say a 10 weight base oil and add VI's to allow it to act like a 30 weight at...