I use Lucas Engine Oil Stop Leak. One quart the first time I need to add (usually at 1400-1600 miles), lets me average 1200 miles per quart for the rest of my change interval of about 8000 miles.


2002 X5 3.0 359,000 miles
2014 428i 63,000 miles


2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles
1970 Firebird Under restoration