I would use 0w40 Synthetic on an old Bav engine 10/40 would be fine but hard to fine today. the first number would be how fast the oil flows at startup the lower the number the better the second number is the thickness after oil heats up
0W40 is too thin; I really wouldn't use that unless you are running the car in temperatues below 0 degrees F all the time. Look at a user's manual. 20W50 is the recommended grade for most temperature ranges. I like the fact that Valvoline VR1 has higher amounts of ZDDP so that's what I use.
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