Member, P500 Sport, DSC On (>700)
Join Date: Aug 2001
Location: Phoenixville, PA
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using oils other than TWS
One reason to beware when choosing oils other than TWS is that the oil may contain phosphorus compounds. These compounds are used to enhance the anti-wear properties of lubricating oil. Phosphorus is also chemical poison for catalytic converters, reducing their effectiveness.
TWS has no phosphorus, so it's not likely to kill the cats, especially at the rate than many M5s consume oil. Not wanting to replace the cats down the road, I've stuck with TWS. A little savings now could cost me a lot in the future, especially since I plan to keep mine for quite a few more years.
[B]2006 M5 Sapphire Black,Indi red, HUD, rear bags, fold seats, comfort access, BBS RG-Rs 9" f 10"r,275/35 -295/35, Dinan front & rear roll control 84K Miles, still getting 1200 miles per liter TWS
2002 Silver 745 iL
2003 Silver 325XiT
2003 Black Infiniti G35 Coupe
2005 BMW K12S(<8min N'ring)
Vintage Triumph m/c's(110 rwhp/liter -w/pushrods)
Last edited by Jessem; 12th January 2011 at 03:41 PM.