Just my experience. I just may have problems with my engine. UOA results have always shown high lead with 0w40 and 0w30 oil. For the 70,000 miles I have owned the car, oil and filter have been changed every 4,000 to 5,000 miles with mostly synthetic. PO followed the oil change lights which meant around 7,000 miles with conventional oil. Lead may just be residiul junk that is left over from 140,000 miles of use. Who knows??
Car has treated with Auto-RX engine cleaner twice to remove any sludge that might be there. Anyway, car seem to run fine.
Last edited by Russell; 06-15-2007 at 03:53 PM.
Thanks,
1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment