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Old 09-21-2010, 06:10 PM   #1
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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?
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Old 09-22-2010, 10:25 AM   #2
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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?
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Old 09-26-2010, 05:40 AM   #3
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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.
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Old 09-26-2010, 08:48 AM   #4
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What is the actual factory recomended oil for the 6-speed (00 3.2)? The Delvac?
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Old 09-26-2010, 01:00 PM   #5
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Porsche has their own, full synthetic, not expensive either........
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Old 09-26-2010, 01:11 PM   #6
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Hey JFP, is the Porsche Transmission lube only available from the dealer?
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Old 09-26-2010, 02:43 PM   #7
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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).
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Old 09-27-2010, 04:15 AM   #8
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Thanks for the reply.
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Old 09-27-2010, 07:41 AM   #9
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How much does a 987S hold?

This does not look cheap to me:

http://www.****************************************************.com/product/99991754600.html?Category_Code=987maint
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Old 09-27-2010, 01:03 PM   #10
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Quote:
Originally Posted by Flavor 987S
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).
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Last edited by JFP in PA; 09-27-2010 at 01:07 PM.
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Old 09-27-2010, 01:39 PM   #11
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Quote:
Originally Posted by JFP in PA
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.
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Old 09-27-2010, 02:19 PM   #12
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5 speed is 2.25L, 6 speed is 2.8L, so three will do you in either case with some left over.
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Old 09-28-2010, 05:17 AM   #13
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^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.
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