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Engine - Oil Contamination

88pontiac06

Bulletin Number: 88-6-38
Reference Number: 836108
Publish Date: 4/88
Subject: 1.8L AND 2.0L OHC TURBO - OIL CONTAMINATION

Models

Affected: 1984-88 L-4 TURBO 1.8L (VIN J) AND 2.0L (VIN M) ENGINES IN SUNBIRD AND GRAND AM VEHICLES
The cleanliness of oil in a turbo application is extremely important, as implied by the "more frequently" change interval status in the owner's manual. Any "built-up" oil contamination in the lubricating system should be eliminated. That is why the service manual procedure (Section 6J-4, regarding oil change with a turbo replacement) should be followed.

An often overlooked source of contamination is the turbo oil feed and return lines. A new turbo's bearings can be quickly destroyed by any line contamination.

Before installing a new turbo, both the feed and return oil lines should be checked visually for contamination and by probing with a length of wire. If contamination is suspected, replace the suspect line.

Use applicable service labor code and labor time.