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I have a 1998 Catera. There is a tan, greasy substance in the oil filler tube. There doesn't appear to be any water in the oil. It has been suggested that it is a blown head gasket but with the lack of water in the oil, I wonder if it could be something else. A friend said that there is some kind of plug you can replace that will make this problem go away. Any suggestions? Anything would be greatly appreciated.

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That is probably sludge, change the oil. If you have any fears, send an oil sample to http://www.blackstone-labs.com/ for analysis.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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