could u please tell me what kind of oil to use in a 2006 hummer h3
SAE 5W-30, 100% SYNTHETIC OIL
hummer mech said to use a synthetic blend. i have been for 5 yrs. he said don't swith over to 100% synthetic. i 145k miles on my 08 h3
172k and going strong! 5w-30 Mobile 1
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