Mixing synthetic oil - 6SpeedOnline - Porsche Forum and Luxury Car Resource

Aug 16, 2009 | 12:10 PM

mass

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Mixing synthetic oil

997.2S calls for 0w40 - can I add a quart of 5W30 as the oil level is low or does all oil in the car have to be the same viscosity even if it's all synthetic.

All Mobil One.

Aug 16, 2009 | 01:00 PM

AP 997S

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Quote:

Originally Posted by mass

997.2S calls for 0w40 - can I add a quart of 5W30 as the oil level is low or does all oil in the car have to be the same viscosity even if it's all synthetic.

All Mobil One.

I don't know if the new 997 motor has a different oil capacity than the previous model (ie. 10 quarts). If it's the same or close I expect that one quart out of 10 shouldn't present any problem.

Aug 16, 2009 | 01:03 PM

mass

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My thoughts exactly and I'm doing an oil change in 1 month anyway so all of it is coming out. Capacity is 9 quarts. So 1/9 would be a different viscosity.

Aug 16, 2009 | 02:45 PM

spudz5

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just go and buy a quart of the 0w-40. its the only oil that is porsche approved. why take a chance for only 10 bucks. most likely nothing will happen but to me its just not worth it.