Mobilube PTX transmission oil
10-03-2017, 07:43 PM
#17
10-04-2017, 09:56 AM
#18
10-04-2017, 12:40 PM
#19
Burning Brakes
I don't have a 996 manual but from the 997 manual.
Manual transmission and differential
approx. 3.17 quarts / 3.0 liters transmission oil Mobilube PTX Formula A (SAE 75W-90) GL 4.5
Porsche Doppelkupplung Wheel set
approx. 3.12 quarts / 2.95 liters ATF transmission oil Mobilube PTX Formula A (SAE 75W-90) GL 4.5
So Mobilube PTX is Porsche approved. The big difference is friction modifiers added to PTX. It a bit more "slippery" and helps when the transmission is cold and can alleviate balky shifting.
approx. 3.17 quarts / 3.0 liters transmission oil Mobilube PTX Formula A (SAE 75W-90) GL 4.5
Porsche Doppelkupplung Wheel set
approx. 3.12 quarts / 2.95 liters ATF transmission oil Mobilube PTX Formula A (SAE 75W-90) GL 4.5
10-04-2017, 05:20 PM
#20
Rennlist Member
I don't have a 996 manual but from the 997 manual.
Manual transmission and differential
approx. 3.17 quarts / 3.0 liters transmission oil Mobilube PTX Formula A (SAE 75W-90) GL 4.5
Porsche Doppelkupplung Wheel set
approx. 3.12 quarts / 2.95 liters ATF transmission oil Mobilube PTX Formula A (SAE 75W-90) GL 4.5
So Mobilube PTX is Porsche approved. The big difference is friction modifiers added to PTX. It a bit more "slippery" and helps when the transmission is cold and can alleviate balky shifting.approx. 3.17 quarts / 3.0 liters transmission oil Mobilube PTX Formula A (SAE 75W-90) GL 4.5
Porsche Doppelkupplung Wheel set
approx. 3.12 quarts / 2.95 liters ATF transmission oil Mobilube PTX Formula A (SAE 75W-90) GL 4.5
Think it has to do more with additives that improve fluidity and the TE-ML 11 spec, which is a ZF spec dictating longevity.
10-04-2017, 08:24 PM
#21
Burning Brakes
I question that since the spec for Porsche transmissions is not to be too slippery for the best synchro performance. One of the reasons they recommend oil without friction modifiers!
Think it has to do more with additives that improve fluidity and the TE-ML 11 spec, which is a ZF spec dictating longevity.
Think it has to do more with additives that improve fluidity and the TE-ML 11 spec, which is a ZF spec dictating longevity.
From Mobil:
Product Description
Mobilube PTX is a SAE 75W-90 multipurpose gear lubricant. It has been developed to provide outstanding performance specifically in Porsche 911 transaxles. It provides low temperature fluidity with high temperature stability ensuring excellent wear protection in these transaxles over a wide range of operating conditions.
Features and Benefits
The combination of synthetic base fluid technology and special high performance additives have been carefully formulated to meet the low temperature fluidity requirements of Porsche. It also provides excellent synchromesh compatibility and 'shiftability', whilst maintaining excellent wear protection.
Mobil PTX provides the following benefits:
Excellent low temperature fluidity, giving easier gear changing from cold over conventional SAE 80W-90 and 75W-90 grades.
Excellent synchromesh compatibility / durability.
Good thermal /oxidative stability.
High level of wear protection under some of the most severe conditions.
Mobilube PTX is a SAE 75W-90 multipurpose gear lubricant. It has been developed to provide outstanding performance specifically in Porsche 911 transaxles. It provides low temperature fluidity with high temperature stability ensuring excellent wear protection in these transaxles over a wide range of operating conditions.
Features and Benefits
The combination of synthetic base fluid technology and special high performance additives have been carefully formulated to meet the low temperature fluidity requirements of Porsche. It also provides excellent synchromesh compatibility and 'shiftability', whilst maintaining excellent wear protection.
Mobil PTX provides the following benefits:
Excellent low temperature fluidity, giving easier gear changing from cold over conventional SAE 80W-90 and 75W-90 grades.
Excellent synchromesh compatibility / durability.
Good thermal /oxidative stability.
High level of wear protection under some of the most severe conditions.
10-04-2017, 08:57 PM
#22
Rennlist Member
Well, damn. I just spent some dough flushing mine w/ the "standard" Porsche fluid, and didn't experience any improvement. Sounds like I should have gone with this.
10-04-2017, 09:45 PM
#23
Rennlist Member
I'll defer to just about anybody on the specifics. I'm still about 140 credit hours short of a degree in chemical engineering. But PTX solved most of my balky shifting problems. Shifting was smoother and the dreaded 1st gear lock out all but disappeared.
From Mobil:
From Mobil:
Product Description
Mobilube PTX is a SAE 75W-90 multipurpose gear lubricant. It has been developed to provide outstanding performance specifically in Porsche 911 transaxles. It provides low temperature fluidity with high temperature stability ensuring excellent wear protection in these transaxles over a wide range of operating conditions.
Features and Benefits
The combination of synthetic base fluid technology and special high performance additives have been carefully formulated to meet the low temperature fluidity requirements of Porsche. It also provides excellent synchromesh compatibility and 'shiftability', whilst maintaining excellent wear protection.
Mobil PTX provides the following benefits:
Excellent low temperature fluidity, giving easier gear changing from cold over conventional SAE 80W-90 and 75W-90 grades.
Excellent synchromesh compatibility / durability.
Good thermal /oxidative stability.
High level of wear protection under some of the most severe conditions.
Mobilube PTX is a SAE 75W-90 multipurpose gear lubricant. It has been developed to provide outstanding performance specifically in Porsche 911 transaxles. It provides low temperature fluidity with high temperature stability ensuring excellent wear protection in these transaxles over a wide range of operating conditions.
Features and Benefits
The combination of synthetic base fluid technology and special high performance additives have been carefully formulated to meet the low temperature fluidity requirements of Porsche. It also provides excellent synchromesh compatibility and 'shiftability', whilst maintaining excellent wear protection.
Mobil PTX provides the following benefits:
Excellent low temperature fluidity, giving easier gear changing from cold over conventional SAE 80W-90 and 75W-90 grades.
Excellent synchromesh compatibility / durability.
Good thermal /oxidative stability.
High level of wear protection under some of the most severe conditions.
The description says it exceeds conventional SAE 80w-90 etc. One reason, most hypoid or synthtetic gear oils come with friction modifiers. PTX and Delvac do not have conventional levels of fictiion modifiers.
To be honest never saw a difference between PTX & Delvaic in my climate which has ambient temps on average over a year of 72 degrees, never really gets to freezing.
