what type of motor oil to use

msleo1973
0

Asked by Apr 23, 2009 at 04:45 PM about the 1992 Pontiac Bonneville

Question type: Maintenance & Repair

what type of motor oil to use in 10-30 or 10-40

3 Answers

Jakob Yonan
25

10W30(summer) or 5W30 (winter) although its recomended that you use 10W30 at all times

2 out of 2 people think this is helpful.
Chase Sutherland
6,175

use whatever the car suggests to use. it should say on the dipstick or oil cap. oils are so advanced from before they wont break down as fast so there is no need for heavier weights in the summer than winter anymore

Danny Wang
3,985

Agree with all the previous post. From what I have seen on these motors, 10W-30 were the reccommended oil until the Series III engine, first launched in MY 2004 Pontiac Grand Prix. According to the GM Powertrain website, it was not necessary to use 10W-30 and that 5W-30 oil was okay on 3.8L Series III engines. As to why the change is okay, I am still trying to understand.

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