Been using Amsoil 10w30 for years, this is my 3rd S and have never had a problem. Even had a money shift on my 02 and on the rebuild on my head everything looked brand new @76k, except broken have pics to prove it.....

 

As I said, if you are interested in real data on these oils, go to the Under The Hood and read the UOAs for all the products.

In reality, if you change your oil every 3-5k like lots do, the oil formulation probably doesn't matter.

 

Yes you can feel the difference with Royal Purple. Engine runs much smoother than with Mobil 1 in it. I think sounds better too, not as harsh. Other than that, its too early to tell since it has been two days since i switch from Mobil 1 to Royal Purple.

 

Mobil 1 10W30 since the OEM oil was drained. No problems and it is reasonably cheap at Sam's Club.

 

Redline 5W-30 in everything but the S2000 which only has 2k on the odo

Used Redline in the old AP1; 5W-30....MTL in the trans and LE607 in the diff

 

if the mobil one is good enough for the porsche, its good enough for my s, going on 7 plus years and never a problem

 

Q Horsepower for me.