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just dumped out the PLATINUM 5w-20 synthetic and went back to SHELL 5w-30 full synthetic . The oil poured out of the pan like it was water . There was no increase in mileage and the engine was noisier on interstate and when revving engine between gears . This is last time I'll likely take or listen to anyones advice on oils . Plan to drain the PLATINUM ( synthetic ) 5w-20 out of the '08 sedan tonight . Will be replacing with the SHELL full synthetic 5w-30 as well . I'm sticking with the owners manual and oil cap recommendations . This is for any vehicle present or future . So , not worth the so-called incease in mileage or better circulation for cold starts .
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