Everyone is thinking, great. Guys I'm sure it's antifreeze also please keep in mind the "milkly gunk" the one time on the oil cap. For about a month the wife was taking it on the weekend and she only knows one speed. "FAST". Now that she is ban untill the repair is done I think I can make it until spring.

Guys. How can I tell if my engine is M54? Or what type?

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2001 X5 3.0
1989 325is
2005 Altima V6 (wife)