A friend just asked if I wanted a case of M1 MX4T motorcycle oil, a 10W40 motorcycle oil. He sold his bike this fall, and thought I could use it in my car...for FREE!!! What makes the motorcycle formula different from the car formula...I know bikes tend to run the same oil thru both engine and tranny so shear resistance is important; but would that not be good in cars, too? Also, the bike oils have no mention of anything API, so might the add. pack. be more robust? I have no idea...any thoughts??? PS - I think he said the oil was $10.00 liter Cdn M1 Auto is about $7.00 Cdn...???