Oil Change, Royal Purple

[Brucelee]

"Also, Porsche specifically recommends Mobil1, not merely a synthetic. This is not due to broad availability or some SweetHeart deal they have with Mobil Oil. Mobil1 is truly the best of all the synthetics. It is produced using the PAO method (meaning it is a true synthetic with no trace amounts of Sulphur or Phosphorus which Dino Oils contain, and which are very destructive to an engine). And, Mobil1 contains only 10%-12% addditives by volume (depending upon the type). Royal Purple and RedLine contain nearly twice as many additives by volume meaning that they actually contain less Base Stock Oil/volume, in other words, there's more Oil in Mobil1 than RedLine or Royal Purple. They're not necessarily awful, but they're not as good as Mobil1."

We are going to disagree on this one Jim. Most oil experts I know would take an Ester based oil over an PAO oil any day of the week. However, they are more costly on balance.

I have seen used engine oil analysis done on Red Line vs M1. The RL oil simply does better on these tests, hands down.

This does not mean that M1 does poorly, in fact it is a superior oil. However, it DOES tend to shear quickly in HP engines like the Box. The ester based RL oil does particularly well in shear tests, and has the highest HTST rating of any oil I have ever seen. That is why racers love RL.

Moreover, the wear levels of RL in used oil analysis are superior to any oil I have seen tested.

I am not arguing against M1, I use it in my BMW. I use RL in my air cooled M/C, as it handles the heat much better than M1.

BTW- Overall, PAO oils test out to be a bit inferior to Ester based synthetics, but then again, they usually cost less.

Lastly, the 15W-50 oil is fine to use depending on temp and use. It used to be in the manual but that stopped when the M1 deal got cut with Porsche.