1997 Other GMC Models oil

1997 GMC
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LOOKAUTO
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Engine Performance problem
1997 Other GMC Models V8 Automatic 91000 miles

my truck is a diesel what grade or weight of oil should I use? No owners manual in truck
Jun 24, 2009 at 12:07 PM
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MICKEY-D
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I prefer a good 15w40 oil, Shell Rotella is one, and maybe a 10w30 for colder climates. I'm sure some will disagree, but it's personal preference. When I lived in N.Y. that's what I used in my diesel Caddy....................Mickey-d
Jan 17, 2010 at 8:44 PM