hmm...dealer frowns on MT90 ingredients >>
10-10-2005, 10:02 AM
#1
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hmm...dealer frowns on MT90 ingredients >>
I rolled into a dealership today and happened to ask a service rep (not a tech, so already I'm suspicious) about doing an MT90 change.
The rep claims that because MT90 is a GL-5 rated lube (which contains sulfur compounds that can corrode brass gear components) it should be avoided in favor of a GL-4 lube.
I know that many here swear by MT90. Does this add up?
The rep claims that because MT90 is a GL-5 rated lube (which contains sulfur compounds that can corrode brass gear components) it should be avoided in favor of a GL-4 lube.
I know that many here swear by MT90. Does this add up?
10-10-2005, 10:23 AM
#5
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GL4, GL5, MT1 and other stuff...
GL-4 requires the ASTM D-130 copper strip corrosion test meet some minimum standard.
GL-5 does not require the ASTM D-130 test for stability in the presence of copper and copper alloys. MIL-2105 does (to strip rating 3), but MT-1 (and MIL-PRF-2105E & SAE J2360) requires an even more severe D-130 test (to rating 2a).
The copper strip rating is determined by ASTM D-130 which is designed to assess the relative degree of corrosivity of the sulphur compounds contained in a petroleum product. The test is carried out by immersing a polished copper strip in a given quantity of sample, heating at a temperature and for a time characteristic of the material and comparing the copper strip after it has been washed and dried with the ASTM Copper Strip Corrosion Standards.
I think you'll find that Redline MT-90 and MTL both carry the MT-1 rating. Having said that, it isn't tested to the VW spec, which would be an issue if you're concerned about warranty.
GL-5 does not require the ASTM D-130 test for stability in the presence of copper and copper alloys. MIL-2105 does (to strip rating 3), but MT-1 (and MIL-PRF-2105E & SAE J2360) requires an even more severe D-130 test (to rating 2a).
The copper strip rating is determined by ASTM D-130 which is designed to assess the relative degree of corrosivity of the sulphur compounds contained in a petroleum product. The test is carried out by immersing a polished copper strip in a given quantity of sample, heating at a temperature and for a time characteristic of the material and comparing the copper strip after it has been washed and dried with the ASTM Copper Strip Corrosion Standards.
I think you'll find that Redline MT-90 and MTL both carry the MT-1 rating. Having said that, it isn't tested to the VW spec, which would be an issue if you're concerned about warranty.
10-10-2005, 10:24 AM
#6
It isn't a GL4/5 rated fluid. OE is actually Castrol TAF-X one of the few GL4/5s with the VW501.50
rating for gearboxes. The TAF-X is actually good stuff and costs $15 per .5L at a lotus dealer.
A GL4/5 fluid has the EP additives (extreme pressure) that are found in a GL5 fluid but without the corrosiveness to copper and bronze metals in the tranny.
In theory, the GL-4 fluid offers less protection than the OE GL4/5. The VW501.50 requirement corresponds to the protection / performance found in a GL5 fluid.
Some manufacturers also refer to this as GL4+.
A good fluid which offers a slightly thicker base like MT-90 is MotylGear 75w90 which is a GL4/5 fluid that isn't corrosive to the syncros.
www.purems.com carries it.
Dave
A GL4/5 fluid has the EP additives (extreme pressure) that are found in a GL5 fluid but without the corrosiveness to copper and bronze metals in the tranny.
In theory, the GL-4 fluid offers less protection than the OE GL4/5. The VW501.50 requirement corresponds to the protection / performance found in a GL5 fluid.
Some manufacturers also refer to this as GL4+.
A good fluid which offers a slightly thicker base like MT-90 is MotylGear 75w90 which is a GL4/5 fluid that isn't corrosive to the syncros.
www.purems.com carries it.
Dave
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10-10-2005, 10:30 AM
#8
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Thanks - learn something new everyday.....i've run MT-90 in 5 VW's and Audi's ....
in fact my dealer used to put it in my VW's. I just put MT-90 in the TT and it's shifting better than it was previously.
10-10-2005, 10:33 AM
#9
I was gonna go the way of the MT-90 as well (A3 02Q tranny) but ended up trying this stuff
highly recommended and tested on BITOG.
A lot of the MTL-R users were former MT-90 or MT-90/MTL users too.
Dave<ul><li><a href="http://specialtyformulations.com/index_file/product/mltr.htm">http://specialtyformulations.com/index_file/product/mltr.htm</a</li></ul>
A lot of the MTL-R users were former MT-90 or MT-90/MTL users too.
Dave<ul><li><a href="http://specialtyformulations.com/index_file/product/mltr.htm">http://specialtyformulations.com/index_file/product/mltr.htm</a</li></ul>
