What is the recommended oil to use in 98 Pontiac Grand AM GT with 143,000 miles. Would changing to a synthetic blend cause a leak?
2007-07-02 02:47:36 · 3 answers · asked by stg22 1 in Cars & Transportation ➔ Maintenance & Repairs
Most cars have the correct weight marked on the oil filler cap.
As for synthetic oil causing a leak, that used to happen occasionally in older engines back in the days when the detergent additives in oil weren't very good, and would allow sludge to build up and seal a gasket that might otherwise leak. The synthetic oil would clean out the sludge and expose the leak. It's not a problem anymore because, with modern oils, engines stay much cleaner inside.
2007-07-02 03:20:07 · answer #1 · answered by gringomasloco 3 · 0⤊ 0⤋
The engine has lasted this long with conventional engine oil. Do not change brands now. Continue with the manufacturer's recommendations. Keep the oil clean & enjoy many more years of motoring.
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2007-07-02 03:14:44 · answer #2 · answered by Mr. T 7 · 0⤊ 0⤋
a blend would not "cause" a leak....but syn and semi syn blends tend to be thinner...many are 5w or even 0w.... if u switch try a special high miliage oil most co's have come out with...10w 30 in winter and 20 w 40 in summer...
2007-07-02 03:16:24 · answer #3 · answered by Anonymous · 0⤊ 0⤋