I just bought a 1999 BMW 528iT with 105,000 miles. I have no maintenance records, but I did get a good price on the car. When you remove the oil cap, there is a good bit of crusty material on the plastic baffle. I have yet to have a chance to replace the leaking valve cover gasket, so the condition of the head is unknown. The oil level light comes on frequently, although the dipstick says the oil level is full. After removing the oil level sensor from the pan, there appears to be a significant level of sludge in the sensor and in the pan (although some of the pictures I have seen here look worse.) The oil filter didn't look particularly bad. I immediately changed the oil using a new filter and Mobil 1 Synthetic. Then I started reading about Auto-RX, and I guess I should have used Dino oil instead. Advice here? Also, the transmission scares me. It shifts fine, but there is no dipstick for the fluid. BMW claims lifetime fluid is in the tranny, but that's got to be a load of **. I am thinking of dropping the pan and replacing the filter and whatever fluid comes out with the $25/qt BMW fluid. Some say I should be fine, but others say the Mileage is too high, just leave it alone and let the tranny die. Advice here? Thanks!