troop
Well-known member
Look at your API Service symbol on your bottle. This example is from a 5w20 oil. If the lower bar shows energy conserving, do not use in your wet clutch m/c. I doubt your M1 10w40 oil has energy conserving on it. ALL oils have friction modifiers of some sort. Not all are bad. M/C specific oils tend to have higher levels of zinc and phosphorous. They're also formulated to shear less quickly due to being used in motor/clutch/tranny. Will the M1 10w40 work in your Spyder? Sure. Will it be the best oil to use? No