[200q20v] Re: GL4 lubricant choice

Kneale Brownson knotnook at traverse.com
Mon Dec 11 10:01:03 EST 2000

Doesn't Audi specify GL4 for manual transmissions and GL5 for 
differentials?  I thought the reasoning was that GL5 didn't let the syncros 
in the transmission work properly.

At 08:55 AM 12/11/2000 -0500, Glen Dustin Powell wrote:

>"Mobiltrans SHC 50 meets the API MT-1 EP gear oil service classification and
>is suitable for transmissions and gear cases where API GL-1 through GL-4 gear
>protection is required. It is NOT suitable for hypoid gear applications of
>differentials and final drives....."
>Seems a contradiction. They claim GL4 compliancy, but say no-can-use in 
>final-drives, but Audi specifies GL4...?
>Is this a mere nit to pick? Are we simply beating the dead horse's bones 
>into ever finer dust?
>-----Original Message-----
>From: 200q20v-admin at audifans.com [mailto:200q20v-admin at audifans.com]On 
>Behalf Of WARATAP at aol.com
>Sent: Friday, December 08, 2000 6:29 PM
>To: pwaterloo at compuserve.com; 200q20v at audifans.com
>Subject: [200q20v] Re: GL4 lubricant choice
>Look what I found. Please forgive the wordiness (I copied it straight off the
>sight;-)   Maybe this is the one you should consider if you're thinking about
>Mobil Synthetic, especially when you look at the application data.
>While I'm interested, I have no vested interest.
>'91 200q20v with a few mods...
><http://www.mobil.com/mobil_lubes/lubes/index.html>Click here: Mobil ATF, 
>Grease and Gear Oil
>Mobiltrans SHC® 50
>Product Description
>Mobiltrans SHC 50 is a synthetic, heavy-duty SAE 50 gear oil manufactured
>from a blend of synthesized hydrocarbons and carefully selected esters. The
>additive system provides outstanding high-temperature detergency and
>wide-temperature dispersancy with optimized protection against thermal
>degradation and oxidation, wear, and corrosion.
>Mobiltrans SHC 50 is formulated to provide maximum performance in truck and
>other commercial transmissions where a high-quality engine oil formulation is
>preferred over a sulfur-phosphorus high-EP gear oil. In those applications,
>Mobiltrans SHC 50 provides maximum stability at high temperatures to prevent
>carbon deposits and prolong seal life. It will not corrode copper and its
>alloys, thereby providing maximum protection for gear synchronizers.
>Mobiltrans SHC 50 has the same viscosity as most SAE 50 engine oils and SAE
>90 gear lubricants at the high end of the temperature-viscosity scale.
>However, because of its inherently higher viscosity index and unique
>molecular structure, it provides a better protective film at higher
>temperatures than conventional oils, without the addition of VI improvers. It
>is completely shear stable and retains its film strength even under the most
>severe mechanical shearing encountered in automotive manual transmissions and
>other non-hypoid gear applications. At low temperatures, the product offers
>an extremely low pour point of -51°C (-60°F) and remains fluid without
>channeling at subzero temperatures.
>Mobiltrans SHC 50 is recommended for year-round lubrication of automotive
>manual transmissions in light-duty to extremely heavy-duty on-highway
>vehicles and off-highway equipment. This includes subzero conditions in
>arctic climates and operations requiring lubricants with relatively high
>viscosity and good load-carrying ability. Eaton and Rockwell transmissions
>specify heavy-duty API CD engine oils exclusively if normal or extended
>drains must be maintained. Mobiltrans SHC 50 is a fully approved Eatonª
>Roadrangerª quality lubricant. It is designed for transmissions covered by
>the Eaton Roadranger and Rockwell extended warranties of 750,000 miles, with
>oil drains of 500,000 miles. It is, also, approved by Mack against its new
>T0-A+ 500,000 mile extended service specification.
>, either for topping-off or refills, where API
>GL-5 or MIL-PRF-2105E multi-purpose lubricants are specified.
>Mobiltrans SHC 50 is ideal for extremely low- and high-temperature
>applications. It provides outstanding thermal stability, deposit control, and
>seal protection exceeding the proposed PG-2 performance level. It provides
>excellent FZG gear protection in stages 1 through 11. It also provides
>outstanding CRC L-60 gear oxidation and thermal breakdown deposit protection.
>Mobiltrans SHC 50 is a good companion for Mobilube SHC 75W-90 and 80W-140 for
>fleets converting manual transmissions and rear axles to synthetic products
>for gear life filling (500,000 miles).
>It provides maximum protection, all-weather performance, and a fuel economy
>advantage of up to three percent when used in conjunction with a synthetic
>rear axle lubricant. Mobiltrans SHC 50 also can be used as a companion to
>Mobil Delvac 1 in a synthetic lube package for fleet applications.
>Typical Characteristics
>Physical characteristics shown in the table are typical and may vary 
>Mobiltrans SHC 50
>Product Number 51111-3
>SAE Number 50
>Gravity, API 30.0
>Pour Point, °C (°F) -51 (-60)
>Flash Point, °C (°F) 228 (442)
>Viscosity, cP at -40°C cSt at 40°C
>cSt at 100°C 140,000
>Viscosity Index 148
>Sulfated Ash, wt % 1.0
>Zinc, wt % .015
>TBN, ASTM D 2896 7.0
>Copper Strip Corrosion, 3 hr at 250°F 1A
>ASTM Foam, Seq 1, 2, 3 0/0,0/0,0/0
>FZG Rating, 11 Stages Pass
>CRC L-33, Moisture Corrosion Pass
>CRC L-60, Thermal Stability, 300 hr Excellent
>Rust Test, ASTM D 665 Pass
>Four-Ball Wear, Scar Dia, mm, ASTM D 2266 0.26
>Eaton Roadranger Extended Warranties Yes
>Eaton Roadranger Extended Drain (500K miles) Yes
>API GL-4 Performance Yes
>Mack T0-A+ (500,000 mile) Yes
>Mobiltrans SHC 50 offers these advantages and benefits:
>Excellent load-carrying, antiwear, and EP performance for manual 
>Outstanding protection against deposits on seals, resulting in longer seal
>Maximum protection against corrosion of copper and its alloys thereby
>protecting gear synchronizers
>Control of high-temperature deposits
>Outstanding low-temperature fluidity with pour of -51°C (-60°F)
>Extended drain capability with Eaton Roadranger and Rockwell extended
>Fuel economy
>Health & Safety
>Based on available toxicological information, is has been determined that
>this product poses no significant health risk when used and handled properly.
>Information on use and handling, as well as health and safety information,
>can be found in the Material Safety Data Sheet which can be obtained from
>your local distributor; via the Internet on 
><http://www.mobil.com/>http://www.mobil.com; or by
>calling 1-800-662-4525 and selecting prompt 2.
>For additional technical information or to identify the nearest U.S. Mobil
>supply source, call 1-800-662-4525.
>Exxon Mobil Corporation
>3225 Gallows Road, Fairfax, Virgina 22037-0001 Mobiltrans SHC® 50
>PDS A-26 5398040 (08-31-98)
>° Copyright 1986, 1990, 1994, 1996, 1998. All rights reserved.
>Due to continual product research and development, the information contained
>herein is subject to changes without notification.

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