There are a few GL-5 rated MT fluids for specific vehicles that have common MT and Differential sumps. Market place that are GL-4 rated, but are not MTF’s. Now GL-4 does not necessarily refer to MTF’s, as there are some gear lubes in the These fluids were successful because they introduced a specific friction modifier chemistry that insured smooth synchro engagement and disengagement.ĭedicated or Application Specific MTF’s for Manual Transmission or Transaxle use an additive package containing Anti-Wear (AW) additives, rust and corrosion inhibitors, emulsifiers, and specialized Friction Modifiers, and are generally protection rated at the SAE GL-4 level. Later, companies such as Amsoil and Redline introduced MTF’s in various viscosities. This fluid fulfilled the specifications for both GM and Chrysler manual transmissions as their factory fill. Then along came Pennzoil which introduced “Pennzoil Synchromesh” MTF with a 9.3 viscosity. Today’s MT fluids contain a multi-functional phosphorus chemistry as the primary AW additive with increased levels of synthetic fluids. Later, the EP additive was dropped for increased levels of ZDDP as the primary AW additive. The AW component was primarily a reduced level of EP additives with a low level treatment of ZDDP for anti-oxidant purposes. Purported to have been formulated by Texaco, these early MT dedicated GM fluids were partial synthetic fluids that contained a synthetic oil component of alkylated benzene for low temperature operation. One of the first of these dedicated MT fluids were the GM Synchromesh series of fluids in the viscosity range of API 5W30 engine oils, or the SAE Gear Oil 80W85 range, or 10.5 These fluids were originally targeted for the GM series of synchromesh transmissions. We will not be discussing transmission lubricants for Heavy Duty truck transmissions or those transmissions requiring MT-1 rated lubricants. Note: This white paper is directed toward light truck and passenger vehicle manual transmissions. Before these fluids were introduced, engine oil’s such as 5W30 or gear lubes such as 75W90’s were specified, depending on design. Manual Transmission (MT) Lubricants (Updated )Įver since dedicated MT fluids appeared on the scene (such as the GM Synchromesh series of fluids), drivers have seen better shifting due to better synchro engagement and improved shifter-fork movement, attributed to the specialized additive package used in these lubes. Posting it here since people new to BITOG do not look in the White Papers forum.
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