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5-w30 is the recomendation from GM. The LL8 inline six has very tight tolerances and requires a lighter viscocity for engine protection.
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Earn +20 ptsQ: What kind of oil should I use for 2002 Trailblazer?
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What weight of oil should be used in 2002 Chevy Trailblazer?
Look at your oil cap. The weight is on the cap.
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