07 e90 335i under maint/warr till 9/2013 or 100k mi. Owned since 46k mi.
Best run a couple weeks back was 13.0 @109mph. MPH was consistent all night. New Tire or DR coming soon.
I brought the car in for service due to the car telling me. Turned out to be some roadworthy service that doesnt apply to arizona. worthless visit.
While I was there I mentioned the exhaust flapper rattle, needed washer fluid, and rough idle.
They discovered
- A leaky washer pump replaced under warr= $50 ded.
- Would not replace exhaust system due to my modified exhaust (downpipes), but agreed to disable it (like a golf tee mod).
- Extensive carbon build up in the intake valves = $850 - 15% coupon.
Car runs like a champ, and i noticed that boost comes on more smooth than before almost seamless. Interested to go back to the track for more mph now vs. before.
After doing some research on DI engines. Since air and fuel arent mixed in the intake manifold nothing passes by to clean the back side of the valves.