it isnt beyond reasonable to think that certain oils work better in certain motors than others. Sure they can can run fine, but not optimally. Its the same if you run 5w30 or higher in a hybrid, you wont get the best fuel mileage; or if you use a non-pag oil in an a/c compressor, it'll make a lot of noise and eventually explode inside; or how certain transmissions call for certain fluids.
You cant simply put off the idea because you dont believe it to be possible.
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