Which oil should I use

1999 CHEVROLET BLAZER
120,000 MILES • 4.3L • V6 • RWD • AUTOMATIC
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DIEGOESOLORZANO
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Greetings. I currently own the vehicle listed above from Venezuela. It was supposed to use 5w30 engine oil according to owner´s manual, however the previous owner was using 20w50 oil and all of the mechanics here recommend me it. The engine has 120,000 miles. Which oil should I use? Should I continue using 20w50 engine oil or should I change back to factory 5w30 engine oil? Consider the weather in Venezuela is tropical, we have a standard temperature of 27~30°C. Thanks
Sep 7, 2017 at 10:03 PM
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STEVE W.
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Well it made it this far on the 20W50 and it is available.

I run 10W30 synthetic in my 2002 Blazer and it has over 180,000 miles on it, but I am no where near the tropics. My current outdoor temperature is 4°C.
Sep 8, 2017 at 12:23 AM