jliang

Hey all,

I have a 2005 Porsche Boxster S that I'm looking to do a transmission fluid flush on. I've scanned the Porsche Classic Parts Catalogue as well as reached out to a few different dealerships around the country but I've been unable to find a definitive answer on what PN the fluid actually is.

Some dealers are referring me to part number 000 043 305 00 SP, while others list part number 000 043 305 49. Does anyone know if the -49 PN is a revision or supersession of the -00 PN? Are these fluids interchangeable?
To add more options to the mix, some dealers list 999 917 546 00 and 999 917 545 00 as the transmission fluid as well. Are these also obsoleted PNs or just a different nomenclature for the same fluid?

Am I totally off the rails? What are people using for their transmissions?

Thanks guys!

Dave in Chicago

Can’t remember if I bought at local dealer or more likely from Suncoast, but this is the actual product I received…

Manual transaxle fluid ‘05 BS 6-speed

jesseellington

First, I know nothing about the part numbers but I’m sure any gear oil Porsche sells you is fine and “flushing” a manual tranny is not needed. Just drain and refill. I’ve used various 75-90 gear oils in my two so far cars with no drama. If you don’t drive in extreme cold then Dino oil or synthetic will probably feel similar. Sure you know if you have LSD trans you need oil with that designation. I’ve never had a LSD trans. I drain and refill mine every two years or so because of how hard it gets driven, cheap insurance to have the hope the trans won’t fail at the track. Oil always comes out looking good. Kendal 80-90(Dino) and Brad Penn 75-90(syn) on my gear oil shelf now. Mobil products seem well regarded by lots of users. Redline if you like fun colored oil!

hueyhoolihan

i recently bought a gallon of 75-90W gear oil at O'Reily's Autoparts for about $18.00.

all of my cars (five), including my 987.1 2.7l are manuals and use the same stuff. i use it in their differentials too, and never a transmission or diff problem in my life. ...not all that fastidious WRT changing the oil either.

having said that, i have plans to change the transmission oil in my 2001 dodge ram's manual transmission soon. it's got 90,000+ miles on it and it's never been done. ...probably could use it.

lightguy

Off topic but when changing the tranny oil in my 02 GT2 the unique Porsche stuff was crazy expensive so I looked elsewhere for an alternative.
Found it at Amsoil. Apparently they had a blend that was the exact or better equivalent for 1/4 the price. Sign me up.
Don't skimp on quality engine or tranny oil.

jesseellington

Porsche doesn’t make oil so any that meets the spec is fine IMHO. I like a branded oil personally. The older cars trannys aren’t high tech. If I had a PDK tranny someone else would probably be doing the service.

XuTVJet

Do the factory equipped LSD cars require a special fluid additive in addition to the 75-90W gear oil? I see posts saying don't run to slick a gear oil or it will impact LSD operation. Others say add 75-90W with a "bit" of LSD friction modifier. My 2011 Cayman Base came with a LSD from the factory.

KevinGross

Porsche changes the part number on their transmission fluid frequently, for no discernible reason. When I last checked in February, the active part number was 000-043-305-05. It is very good stuff and I recommend it to my race customers. It is also wonderfully stable at cold temperatures, so a win if you drive four seasons. Yes, it's more expensive.

Alternatives I recommend are Mobil 1 Syn Gear Lube 75W-90 and Motul Gear 300 75W-90. You do not need an LSD additive.

Jesse, you're right, Porsche doesn't make gear oil. Actually, they make very little, mostly assemble parts from subcontractors. But as to the oil, they do spec it to their supplier(s), they do test it, and their engineers are pretty smart. I would not rush to assume their specs given to suppliers are identical with the specs those suppliers use for retail products.

jliang

Thanks for all the replies gents. A lot of people on the forums have info that says Mobil1 Mobilube PTX is the OEM supplier for the non-LSD fluid. A lot of people have also reported harder shifting with non-oem fluids, so with no data of my own and seeing as it's a 30k service interval regardless, I'll err on the side of caution and splurge for the OEM fluid. Your inputs are very much appreciated however.

Regarding the OEM fluid PNs, Porsche Marin (Sonnen) has gotten back to me with the most concise answer to date:



So it looks like there is only one type of oil, just the PNs have been superseded over the years and there appears to be some designator in there for volume.

A lot of other dealers and FCP have said that the -49 is only for the 986 generation and some even say its 5-speed only, but given that my car is a 2005 and has the older M96 engine and G8720 transmission it's possible these statements are both true.

In either case, the -49 PN seems more prevalent and more dealers stock them, so it's likely that regardless of supersession, people are putting this fluid in their cars without issue.

Thanks for all the help as always, the Rennlist braintrust never fails me

kiwi74

Good question,... I'm wondering the same. Only fluid I didn't change yet and I'd like to do it soon too. PTV LSD transmission fluid; what to get?

The Duke

@KevinGross to confirm - this is the same part number for the 2010 Cayman S 6 speed MT?

Also, thanks very much for you support in this and other rennlist forums!

KevinGross

Yes, same part number. Glad to help!

The Duke

@KevinGross I'd like to ask for your help one more time - on this topic at least..

I ordered PN 000 043 305 05 from Pelican and got the VW Group PN 052 798 A2.

As the former PN was applied on the label, Pelican believes that they are the same.

What do you say?

KevinGross

Hmmm... I don't know. They could be the same, but I have no way of telling. The Porsche fluid I've seen always comes in Porsche branded bottles, with the correct Porsche part number.

J-RAD

I just did mine. Went with Redline 75W90.