911mhawk

PTX from Mobil.com:

MOBILUBE PTX 75W-90

Mobil Passenger Vehicle Lube, Finland
Axle Oil

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.

Specifications and Approvals

MOBILUBE PTX 75W-90 has the following approval:Approved TE-ML 11X
According to ExxonMobil, Mobilube PTX 75W-90 is of the following quality level:API GL-4XAPI GL-5X

Typical Properties

MOBILUBE PTX 75W-90ViscositycSt @ 100ºC14.5cSt @ 40º C77.6Viscosity Index195Flash Point, ºC226Pour Point, ºC-60Density kg/m3849



AND DELVAC from their site too:

Mobil Delvac Synthetic Gear Oil 75W-90, 80W-140

Mobil Commercial Vehicle Lube, United States



Supreme Performance Commercial Gear Lubricants

Product Description

Mobil Delvac Synthetic Gear Oil 75W-90 and 80W-140 are synthetic drivetrain lubricants engineered to meet the most demanding extended drain and warranty requirements. These products are designed for use in heavy-duty drivetrains that require gear lubricants with relatively high viscosity and excellent load-carrying capability and where extreme pressures and shock loading are expected. Mobil Delvac Synthetic Gear Oil 75W-90 and 80W-140 incorporate the latest technology in synthetic basestocks and advanced additives providing significant advantages over mineral gear oils.

The state-of-the-art technology in Mobil Delvac Synthetic Gear Oil 75W-90 and 80W-140 delivers unsurpassed performance for low and high temperature application, protection against thermal degradation and oxidation, reduced wear and corrosion, improved shear stability, extended service capability, and excellent fuel economy. These products meet or exceed the requirements of API service MT-1/GL-5 EP gear oil service classification and are recommended by ExxonMobil for use in applications requiring the MIL-PRF-2105E specification.

The outstanding performance of this product is confirmed by its approval for final drives covered by Eaton Roadranger (E500) and Meritor Extended Warranties of 750,000 miles, with extended oil drains of 500,000 miles. They are also approved by Mack against GO-J Plus (75W-90) and GO-J (80W-140) extended service classifications.

Features and Benefits

Today’s technology has vastly improved the performance capabilities of heavy-duty on and off-highway equipment load, torque, speed, and control through innovative drivetrain designs. These designs have changed and increased the requirements of lubricants to deliver this higher level of performance, increase productivity, and reduce operating costs. For heavy-duty final drives, friction control, wear protection, thermal stability, shear stability, rust and corrosion prevention, and seal protection are features that must be optimally balanced to provide extended gear and seal life, smooth operation, improved fuel economy and high load high torque capability over a wide range of applications. The key benefits of Mobil Delvac Synthetic Gear Oil 75W-90 and 80W-140 include:FeaturesAdvantages and Potential BenefitsExceptional thermal stability and resistance to high temperature oxidationExtended gear and bearing life due to minimal deposits
Longer seal lifeOutstanding protection against low speed/high torque wear and high speed scoringIncreased load-carrying capability.
Reduced maintenance costs and longer equipment lifeExceptional shear stabilityRetains viscosity and film strength under severe operating conditions to prevent wearExcellent rust, staining, and corrosion protection of copper and its alloysReduced wear and longer component lifeEnhanced friction reduction propertiesImproved fuel economy and reduced operating costsOutstanding low temperature fluidity versus mineral oilsReduced wear and ease of start-upGood resistance to foamingMaintains film strength for reliable lubricationCompatible with typical automotive seals and gasketsMinimum leakage and reduced contamination

Applications

Recommended by ExxonMobil for use in:

• Heavy-duty manual transmissions, axles and final drives requiring API GL-5 and MT-1 performance
• On-highway light and heavy-duty trucks, busses and vans
• Off-highway industries including: construction, mining, quarrying, and agriculture
• Other heavy-duty industrial gear drives including hypoid and worm gears operating under conditions where high speed/shock load, high speed/low torque, and/or low speed/high torque conditions prevail
• Differentials, final drives, transfer cases and other gear applications where lubricants meeting MIL-PRF-2105E, API Service GL-5 , EP gear lubricants are recommended
• Equipment such as winch reduction gears and crawler vehicle propulsion gear drives that are exposed to severe low temperatures
• Use as a companion with Mobil Delvac Synthetic Transmission Fluid 50 in transmissions for maximum drive train life, efficiency and fuel economy improvement
• Applications where extended service intervals and warranties are required
• Not recommended for applications requiring API GL-4 Level performance
• Not intended for automatic, manual or semiautomatic transmissions for which engine oil or automatic transmission fluids are recommended

Specifications and Approvals

Mobil Delvac Synthetic Gear Oil meets or exceeds the requirements of the following industry and builder specifications:75W-9080W-140API GL-5/MT-1XXSAE J2360XXScania STO 1:0XXZF TE-ML 07A/08X



Mobil Delvac Synthetic Gear Oil has the following builder approvals:75W-9080W-140Dana SHAES 429XXDANA SHAES 256 Rev. CXMack GO-J PLUSXMack GO-JXMeritor O-76NXXMB-Approval 235.8XInternational TMS-6816XXZF TE-ML 05B/16F/21BXXZF TE-ML 12BXZF TE-ML 12MXZF TE-ML 19CXZF TE-ML 17BXMAN 342 Typ M2XVoith Turbo 132.00374401/132.00374402XFlender BA 7302 Table R1XScania STO 2:0 AX



Mobil Delvac Synthetic Gear Oil is recommended by ExxonMobil for use in applications requiring:75W-9080W-140DANA SHAES 256 Rev. AX



Mobil Delvac Synthetic Gear Oil has is of quality level, but not approved:75W-9080W-140MIL-PRF 2105EXX

Typical Properties

Mobil Delvac Synthetic Gear Oil75W-9080W-140SAE Grade75W-9080W-140Viscosity, ASTM D 445cSt @ 40ºC120310cSt @ 100ºC15.931.2Viscosity Index, ASTM D 2270140139Pour Point, ºC, ASTM D 97-48-36Flash Point, ºC, ASTM D 92205210Density @ 15ºC kg/l, ASTM D 40520.8590.870

Anthony Lovero

Mauireman

I have a 71 911t and it has developed a bit of a grind going into 2nd gear, all others are smooth. I'm running Redline MT-90 which from what I've now read isn't correct.

What lube would you recommend?

Thanks!
Dan
911t - 928Gt - 996cab

Bernie930

Your MT90 is not wrong, definitely dont run modern gear oils in a balk ring trans! Likely your 2nd sync or balk ring is wornvor possible more.

Bernie930

I dont wanna get into a oil thread with THE who is who.
But after having done extensive research and testing on 915/930 boxes, do not run motul 300 or mobil delvac! Run ATF for all I care and watch that box shift, seriously,lol!
These gear boxes need special lubricants, that modern style like motul300 or delvac can not provide because they are too slippery, to run baulk style syncros, period! Delvac works great in 996/7 street and race trans. And yes I used to run Redline gear oils in my gearboxes at the Daytona 24 HR with Matt's gears in them. Was it a special blend , heck yes.

s65e90

Royal Purple

Gadsby

Copans confirmed Mobil Delvac Synthetic Gear Oil 75W-90 when he rebuilt my box 8 years ago.