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I just recently bought a 1989 S-10 Blazer with the 4.3 L It is 4x4 loaded and has 160,000 miles on it. I was wondering what oil do you recomend, or what GM recomends. I was thiniing 10W30
Mike
 

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Accent, what accent
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778 Posts
5w-30

5-30 is what the factory calls for. I would also fill w/clean oil and use STP engine flush drain & re-fill just to clean out the engine. you could also use trani fluid 3 qts +1 of oil for 20 min and drain & re-fill. and yes I have done this w/several vehicles.
 

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T/A drivin foundin member
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i have to disagree my friend,

with higher mileage vehicles, parts are starting to get worn, i would reccomend a heavier weight oil. 10-30 in warm climates like so cal, and durng summer, during winter i would reccomend going to a heavier oil. if temps regularly get below freezing id go with 20-50, i am currently running castrol 10-40 synthetic and am very happy with it. whatever you do stay away from 5-30! especially in a vehicle with 160k
 

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ummm... i hope by below freezing you mean over 100 with that 20w50. 20w50 is VERY thick compared to 10w30/10w40 when cold. 20w50 is only for hot temperature climates, like mine!
 
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