1993 GMC Suburban Owner's Manual - Page 278
1993 GMC Suburban Manual
Page 278 highlights
K2543 What Kimd of Oil to Use: Look for three things: so SG mustbeonthe oil container,eitherbyitselforcombined with other qualitydesignations,such as W C C , SGlCD, SF, SG, CC, etc.These f you use oils that don? have the "SG" designation:, yw can: cause engine damage not covered by your warranty;' 6-1 2
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