One of the best charts I have seen to describe and compare engine oil quality after a long time. This chart produced by GM and surprisingly shows API SJ drops in quality for first time in engine oil development history.
۷ خرداد ۱۳۹۵
History of Engine Oil Spesifications
One of the best charts I have seen to describe and compare engine oil quality after a long time. This chart produced by GM and surprisingly shows API SJ drops in quality for first time in engine oil development history.
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