2000 Sunbird L4-121 2.0L VIN B 2-bbl (1984)
Oil Line: Technical Service Bulletins
Engine - Oil Contamination
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.