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Old 11-23-2011, 09:12 AM
jarhed1964 jarhed1964 is offline
Officially Welcomed to the 'Fest
Location: Charlotte, NC
Join Date: Apr 2010
Posts: 714
Mein Auto: '99 528i Sport, '05 530i
Originally Posted by cn90 View Post

Costco (also amazon dot com) sells a fiberoptic camera for $130 (similar to colonoscope that doctors use to look at bowel).
This camera has multiple purposes. it allows to inspect engine pistons etc. etc.

- Octane 87 does not do this.
- The common causes of carbon build-up on top of the pistons:
a. Mixture too rich
b. bad spark plugs create incomplete combustion
c. Oil consumption, in your case it could be a blocked CCV.
Yeah, I figured the CCV had something to do with it, even though no usual CCV symptoms show. I don't know, this guy rebuilds engines and heads for Hendrick BMW in Charlotte. I'm going to heed his rant and never use 87 again in either E39.
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