The Upper Engine Cleaner is AWESOME!
When i had my workshop a couple of years ago, i would use this as part of a service on many jap model cars. i did some research back in the day while a mate was a tech at Subaru and it doesn't hurt to use it on any engine.
pump it into the intake manifold vac line and let it sit for a while then turn the car on rev it up and all the crap goes through the exhaust!
I'm new with the 135 (coming from an all jap garage) so don't quote me if theres something in place thats different to any non bmw engine!
Only cost $25 from memory
