1998 GMC SIERRA oil additives

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Page 295 of 452

GMC SIERRA 1998  Owners Manual To provide  cleaner air, all gasolines in the United  States 
are  now  required to  contain  additives  that will help 
prevent  deposits  from forming 
in your engine  and fuel 
system,  allowing  y

Page 307 of 452

GMC SIERRA 1998  Owners Manual As shown in the  chart, SAE 5W-30  is best for your 
vehicle. However, 
you can  use SAE 1OW-30  if  it’s  going 
to  be 
0°F (- 18 “C) or  above.  These  numbers on an oil 
container  show 
its