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Old 11-23-2011, 08:49 AM
cn90 cn90 is offline
Officially Welcomed to the 'Fest
Location: Omaha NE
Join Date: Mar 2006
Posts: 14,362
Mein Auto: 1998 528i 5-sp 140K+

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.

Last edited by cn90; 11-23-2011 at 08:52 AM.
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