Originally Posted By: Flareside302
Originally Posted By: aquariuscsm
I searched through the UOA's for MC 5W50 and they looked perfect. Looks like excellent oil. If it were available at Walmart I'd use it in my car.
perfect my [censored].. did you go the the svtperformance link I posted? shows the motorcraft shearing massively to a 30..
And I can show you UOA's of TWS 10w-60 shearing to a light 40 in no time flat. It doesn't change the fact that various aspects of the product (like HTHS for example) don't correlate directly with KV, so while the base visc may have sheared out of grade, the HTHS will still be relatively high.
M1 0w-40, the SM version used to shear like crazy too in certain applications. However that didn't stop Porsche, Audi, Mercedes, Chrysler....etc from recommending and using it in their most demanding and high performance applications.
I'm quite sure that with many of these oils that we observe shear in and run around like Chicken Little that this is actually part of the designed behavior. Remember those engineers I mentioned earlier