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Hello all,
I just picked up my "new" 98 convertible and I see that the previous owner was using non-synthetic oil. It has over 100K on the odometer. Should I switch back to using the recommended synthetic oil? Thanks.
Any oil is better than no oil, but fully synthetic meeting GM4718M is the spec. IF you want to keep her running happily for a while use the right oil...
There are several that meet this spec including Penzzoil Platinum which you can often pick up on sale for about $3/qt.