Oil Leak From Distributor Shaft Seal on GMC Sonoma

Problem Description and Possible Solution

An engine oil leak may develop from the distributor shaft o-ring seal.

Problem Data
RepairPal Verified
Average mileage: 175,678 (170,357–181,000)
Engines affected: 2.8L V6, 4.3L V6
6 model years affected: 1991, 1992, 1993, 1994, more1995, 2002
8 people reported this problem
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Thought I had a rear main seal leak. Found that oil was weeping out from under the distributor. Put a new O ring seal and a distributor gasket from a 350 and the leak is stopped.