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post Mar 8, 2014 - 5:21 AM
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fiddler69

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gt4 st205 what grade of engine engine oil are you guys recommending please
 
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post Mar 8, 2014 - 9:26 PM
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Special_Edy



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I would accept that answer for the rear main seal, but the oil pump and oil cooler were catastrophic failures. I understand that synthetic oil has a lower viscosity at low temperatures when compared to an equivalent conventional oil but this was 10W-40 which I run in the summer, versus the 5W-30 I run in the winter.

By stating that synthetic oil may cause leaks to become more apparent or worse you are conceding to my original statement that synthetics may cause leaks on a 15-20 year old motor that has never had synthetic in it, if the lazy PO's even bothered to change the oil. The odds are just greater. Period.

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