GM;
Model Year: 1981
Bulletin No: 81-I-37
File In Group: 60
Number: 11
Date: Feb. 81
Subject:
Silica Contamination of Oxygen Sensors and Gelation of Oil.
Models Affected:
All
Oxygen sensor performance can deteriorate if certain RTV silicone gasket materials are used. Other RTV’s when used with certain oils, may cause gelation of the oil. The degree of performance severity depends on the type of RTV and application of the engine involved.
Therefore, when repairing engines where this item is involved, it is important to use either cork composition gaskets or RTV silicone gasket material approved for such use. GMS (General Motors Sealant) or equivalent material can be used. GMS is available through GMPD with the following part numbers:
1052366 3 oz.
1052434 10.14 oz.