Royal Purple Gear Lube - 6 speed
 

Just wondering who has tried RP gear lube in their 6-speed manual trans-axle.

How do you like it? Are shifts smoother?

As you might expect, Porsche uses a totally unique spec full synthetic gear oil. Gear oil manufacturers, the honest ones anyways, admit that they do not have a compatible lube. Mobil 1 sent me an email in response to one of my customers questions on the subject, stating : “Currently, Mobil 1 does not produce a gear lubricant suitable for Porsche applications.” Other manufacturers have been less forthcoming in what they say.

Perhaps more interesting, we have switched several cars back to the OEM product after they had been using Red Line, RP, Amsoil and other “blends”; the common response has been, “Wow, it shifts much better…..” Considering what these gearboxes cost, and the fact the OEM stuff is not expensive, why bother?

I've had very good luck with the Mobil Delvac gear lube (the one the comes in the gallon container, NOT the quart- apparently they are two very different products).

I am coming to the conclusion though that the factory stuff just may be the best choice.

What is the actual factory recomended oil for the 6-speed (00 3.2)? The Delvac?

Porsche has their own, full synthetic, not expensive either........

Hey JFP, is the Porsche Transmission lube only available from the dealer?

Yes, but you need to check, some only get it in bulk containers (drums), while others carry it in liters. Not sure who makes it for them (a lot of speculation, no proof), but as I mentioned, a couple of "majors" have told me it has unique specs that no one seems to match (too small a market).

Thanks for the reply.

How much does a 987S hold?

This does not look cheap to me:

http://www.****************************************************.com/product/99991754600.html?Category_Code=987maint

That is because it is from Suncost, they are hardly a source for good prices.......you should be able to find it for about $18 or so a liter (retail).

Great news. Do you have a link? Sunset and Suncoast also will price match.

What is the fill capacity for the 987S?

Thanks.

5 speed is 2.25L, 6 speed is 2.8L, so three will do you in either case with some left over.

^Thanks, JFP. I plan to have this done next year, early, at the 5 year mark and probably 40-42,000 mile mark. I'll also do a Blackstone UOA on the drained sample of the trans fluid.