Ptx alternative
Hello I replaced the displacement sensor on my 991 and now I need to refill the transaxle oil.
in Israel we can’t buy the mobilube ptx anyone can recommend the best replacement?
here is a list of available products:Motul gear 300

Motul gear 300 ls

Royal purple

Mobil 1 ls

Amsoil severe

 

Mobil Delvac 75w-90 will be your best second choice if you can get it. Shifting before everything is up to normal operating temp won't be as smooth with the Mobil, but it will work good enough.

 

2009 C2S 174K miles

From my owner's manual: Mobilube PTX Formula A (SAE 75W-90) GL 4.5

Note this is a GL 4.5 which is a spec for our transaxles (not transmissions or differentials, but a combo system). I believe Shell has a product in their Spirax line that is a GL4.5. I also read that small niche suppliers are now producing this. BTW, Delvac is a common for dealers to put this in our cars. It is not what is spec'd, some dealers are completely unaware of Porsche spec, but cars don't blow up if you use it (as nerdnic notes).

Also, if the formulation you are considering notes something about being "more lubrication" or slipery.... avoid them. Your fluid is not only a lubricant, but it is not super slipery... it is carefully formulated to allow for the synchros to grip the cones... this allows them to spin up to be in synchronisity with the ring they are about to engage. There is a reason Porsche spelled out the formulation in the owner's manual.

Good hunting... let us know what you come up with.

Peace
Bruce in Philly (now Atlanta)

 

Shell Spirax S5 ATE 75W-90 should be the second Porsche approved Transaxle fill

Klaus

 

If you can source ROWE HIGHTEC TOPGEAR SAE 75W-90 S it has the lowest cold viscosity I could find in the selection of all for the Aisin G97.01!
I definately will give it a try.

 

I had the Rowe Topgear in my 997.2/Aisin for a year and replaced it with the Shell Spirax

I think the Shell Spirax is shifting smoother on cold weather/temperatur, no difference when warm

Even Rowe itself does NOT give it a go-ahead for Porsche 911 9977.2 7 AISIN, not on their Website, not when callng in (I did)

 

Did they give you an explanation why not? I don't see the slightest reason why it shouldn't work.

 

Not really, just that its not approved by Porsche, not approved by them, no reason given

 

Okay, I think they just don't want to make their own recommendation due to lack of Porsche approval, but the oil is very modern with PAO and ester additivated and has a high viscosity index, so thin when cold and thick when warm.