Actually, unless he's changed his mind, what he has recommended (based on their UOA results) is the Castrol 10w-40.

I spoke with JFP in PA and he highly recommends Castrol 10W 40. Lucky for me, I hadn't changed my oil yet and the local Auto parts store allowed me to trade my 5W 50 in for the recommended 10W 40. I really respect JFP's opinion on this matter. He has a lot of background and research to back up his statements.


This weekend, the Box is going to get a belly full of fresh Castrol Syntec 10W 40!:D

Here's a good read. I use Castrol Edge 5W-40.

FerrariChat.com - FAQ: Motor Oil Articles by Dr. Ali E. Haas (AEHaas)

Lots of half-truths and misinformation IMO. That guy is a surgeon, not a tribologist.

This topic is probably one of the most recurring topics of debate that seem to draw battle lines and start wars. If you religiously change the oil and filter, with a quality synthetic, every few thousand miles, then you probably don't have much to worry about as far as "wearing" out your engine.

I understand why many of us are paranoid about engine failure; however, I think that the benefits of using ONLY one or two brands of boutique oils is equivalent to splitting hairs.

one caveat, DT-40 oil is not recommended for Boxsters that see track use, not sure if that means autocross is also off the table.

Sure it is! That's all I use. I don't know of a better go anywhere, do anything oil.

That's not saying you can't find a better oil for dedicated track use.

PL is correct. Here is the direct quote from Jake:

"All of my engines that see even one day of track service utilize XP-9 and that product is only good for 750 miles before the additive packages are depleted.
So, in other words don't track your car on DT-40."

Not 100%. Here is the direct quote from me:

Sure it is! That's all I use. I don't know of a better go anywhere, do anything oil.

That's not saying you can't find a better oil for dedicated track use.


But thanks for posting the quote from Jake Raby to support my recommendation!

But thanks for posting the quote from Jake Raby to support my recommendation!


Are you nuts?

Crazy like a Fox!! :p

"Tribologist"?? That's a fair number of syllables for you, insite...I confess to having to look that one up myself. I AM impressed! :D