[masraum]

Originally Posted by stealthn

No just yearly, but 3 Porsches

OK, so technically every oil change.

That's another thing that I've wondered about, how often do oil manufacturers change their additive package? You get an oil that you like and works well, but then they change it and is isn't protecting like it once was. Without the analysis you don't know.

Which Mobil 1 are you using? I've always hated buying M1 because at the store there are usually half a dozen different versions and there's no clear indication exactly what makes them different other than the marketing stuff (high mileage, extended coverage, European cars, etc...)

I found this Mobil 1 link a couple of weeks back that is supposed to have more info about the additives (specifically the Phosphorous and Zinc levels (aka ZDDP), but they don't list the levels of molybdenum which is important for our Aluminum based (pistons and bores) motors.

I've also heard that not all of the versions of Liquimoly oil have molybdenum in their additive package.