Engine - Oil Requirements
91chevy20
GMC NUMBER: 91-0B-110
GROUP: 0B Maintenance and Lubrication
DATE: June, 1991
CORPORATE
NUMBER: 160201
SUBJECT: ENGINE OIL REOUIREMENTS
MODELS: 1991 GMC T PICKUP (SYCLONE)
The 4.3L turbocharged engine used in the 1991 GMC Syclone is manufactured with SAE 5W-30 engine oil for break-in purposes. However, starting with the first oil change at 2,500 miles, and at all future oil changes, SAE 1OW-30 "synthetic" engine oil is required. Mobil 1 or equivalent "synthetic" oil is recommended.
See Syclone Maintenance Schedule Supplement for recommended oil change intervals.