manual gear oil suggestions?

[cnavarro]

I would file that response under the cookie cutter answer. If I ask my Mobil rep, they wouldn't know what a Porsche was :-) - just a bit of an exaggeration, but you get the point.


Since the gearbox is sourced from VW/Audi, it would take the same fill and their lube may be a fully-synthetic GL-4 rated gear oil. There are VERY few true GL-4 oils available, most out there are GL-5 rated (which is supposed to be backwards compatible).

The tip's differential on the other hand calls out specifically for a GL-5.

Technically, any 75w90 or 90WT GL5-rated gear lube should meet the requirements for the gearbox IMHO.

It's best to google about vw/audi gearboxes rather than Porsche ones, since you'll find a lot more information and discussions about the vw/audi counterparts to the Porsche ones.

[JFP in PA]

Originally Posted by cnavarro

I would file that response under the cookie cutter answer. If I ask my Mobil rep, they wouldn't know what a Porsche was :-) - just a bit of an exaggeration, but you get the point.


Since the gearbox is sourced from VW/Audi, it would take the same fill and their lube may be a fully-synthetic GL-4 rated gear oil. There are VERY few true GL-4 oils available, most out there are GL-5 rated (which is supposed to be backwards compatible).

The tip's differential on the other hand calls out specifically for a GL-5.

Technically, any 75w90 or 90WT GL5-rated gear lube should meet the requirements for the gearbox IMHO.

It's best to google about vw/audi gearboxes rather than Porsche ones, since you'll find a lot more information and discussions about the vw/audi counterparts to the Porsche ones.

I have less respect for Mobil 1 everyday............

Just for informational purposes, Red Line continues to offer a good selection of GL-4 full synthetic gear oils. Reason I know this is that Nissan continues to require GL-4 gear lubes and the syncros (and some bearings) they use don't seem to last very long with GL-5 oils. We've used the Red Line GL-4's in our client's Nissans with great results.

For what it is worth, under the API specs, the additives’ that make a gear oil a GL-5 should make the oil incompatible with a GL-4 gear box. I know some oil companies have claimed to have oils that can be used in either one, but having seen what a GL-5 oil does to the internals of a GL-4 Nissan gear box, I really wouldn’t trust the claim that a GL-5 is always backwards compatible………….

[941MXVET]

Originally Posted by JFP in PA

I have less respect for Mobil 1 everyday............

I saw this on another site, you may be interested:


https://www.mobiloil.com/USA-English/MotorOil/Car_Care/AskMobil/Group_3_Base_Oils.aspx

[JFP in PA]

Originally Posted by 941MXVET

I saw this on another site, you may be interested:


https://www.mobiloil.com/USA-English/MotorOil/Car_Care/AskMobil/Group_3_Base_Oils.aspx

Not exactly "news", they have been doing this ever since Exxon acquired Mobil in December of 1998, which is why the performance of their oils has deteriorated so much since the acquisition, and why some grades no longer carry ACEA ratings……..

[cnavarro]

We do have some decent long term testing on the Delvac 1, for what it's worth, with the aircooled guys. Many tranny rebuilders, including Guard, recommend it.

Amsoil also makes a GL4 oil, that I used to use in 356 and VW gearboxes before switching to Swepco 201, which anyone before a 915 gearbox swears buy. It's also a GL5 rated oil, for what it's worth.

Interesting you mention Nissans - one of my customers mentioned their use of Motul in their race trannies (and engines) with excellent results.

[JFP in PA]

Originally Posted by cnavarro

We do have some decent long term testing on the Delvac 1, for what it's worth, with the aircooled guys. Many tranny rebuilders, including Guard, recommend it.

Amsoil also makes a GL4 oil, that I used to use in 356 and VW gearboxes before switching to Swepco 201, which anyone before a 915 gearbox swears buy. It's also a GL5 rated oil, for what it's worth.

Interesting you mention Nissans - one of my customers mentioned their use of Motul in their race trannies (and engines) with excellent results.

Can honestly say that I have no history with Mobil Delvac synthetic gear oils, in fact, I don't know who even sells them. Did a quick online search, lots of data but nothing on were to buy. I'll have to make some calls in the morning.

Motul has several interesting products, only problem is that they tend to be very expensive to buy unless you get large quantities, kind of restricting. I've used their stuff as well, and it was fine, albeit pricey..........

Never been much of an Amsoil fan, but only because of their weird MLM-like distribution system, and because history has taught me to shy away from small blenders and stick with larger producers.

[cnavarro]

I did find that Mobil does make a Delvac 1 synthetic transmission fluid 50, which is equivalent to a 90WT, which carries a GL4 rating, which is also now available in gallon jugs. Something worth asking your Mobil rep about.

[tnoice]

Originally Posted by 941MXVET

I saw this on another site, you may be interested:


https://www.mobiloil.com/USA-English/MotorOil/Car_Care/AskMobil/Group_3_Base_Oils.aspx

This statement officially says nothing. No substance, just drink the kool aid!!