I have 1997, 328i auto with 147,000. I have used 15W-40 dino (Rotella T) since 25,000 miles with no consumption. Oil change interval at 3,000 - 3,500.
I've just noticed a slight oil consumption, 1/2 qt per 3000 miles plus a minor leak at rear of motor, just above the round cross member/bar (maybe a 1.5 inch circle on the garage floor over night).
I've been reading a lot of posts on www.bobistheoilguy.com
and several posts there support using a product called AutoRx (www.AutoRx.com
) to clean the internals of your engine through a very controlled procedure and then the minor leaks are resolved through rewetting the seals (assuming they were sludged).
With a 9 year old engine, with 147,000 miles is there anything I should do to improve the odds of getting maximum mileage and performance out of the car as "she" ages. Keep dino and 3000 mile interval? Go syn? change weight?
I plan on keeping her for a very long time.
Our driving conditions are:
Winter: 25 - 30 F
Driven daily 20 miles highway with some city
Weekend 100 mile trips all highway
Garaged at night: 65F
Very little warm up time. Start and back out garage and go.