986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Just did a Royal Purple Oil change, smoke?

blue2000s · 09-22-2009, 10:41 AM

Royal Purple gets a $2-3/qt premium for the 0w40 and 5w40 over the 10w40.

I'd only use the 40 weight oil in my engine. Porsche never recommended the 30 weight oil. Oil that's too light may not have strong enough film strength and will reduce system pressure.

If the smoke is black, it's a fuel related issue, as stated earlier. Burning oil is blue.

09-22-2009, 10:41 AM	#18
blue2000s Porscheectomy Join Date: Mar 2006 Location: Seattle Area Posts: 3,011	Royal Purple gets a $2-3/qt premium for the 0w40 and 5w40 over the 10w40. I'd only use the 40 weight oil in my engine. Porsche never recommended the 30 weight oil. Oil that's too light may not have strong enough film strength and will reduce system pressure. If the smoke is black, it's a fuel related issue, as stated earlier. Burning oil is blue. Last edited by blue2000s; 09-22-2009 at 10:51 AM.