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On 23 Oct 98, at 19:30, Allen Moore wrote: > I will be doing a transmission service. The pan cover is leaking as well > as the > govenor gasket. I have both of the gaskets and it looks like the pan > hasn't been off the trans in a long, long time. While the trans is smooth > and shifts properly, the VW manual states that it should be drained and > the filter screen cleaned every 25,000 miles. I also noted in the Bentley > that on 1970 and later T3's with automatic, the Hypoid 90W oil needs > changing only when contaimated or toppng off when needed and a occasional > cleaning of the magentic drain plugs. The O-ring under the governor cover is a common leaker. Clean the area around the cover carefully before you remove it so you don't drop dirt into the AT. The pan gasket can be hard to seal. If someone has overtightened the bolts in that effort the edge of the pan will be bent and you may never get it to seal. I don't know what kind of sealant you could use there if you have a problem; I would start by trying to straighten the pan. > I figured that this may be a good opportunity to change out the > rear hypoid fluid as I am assuming that VW hadn't planned on this > car being on the road 28 years later with the same Hypoid 90W in it. Agreed. > When I went to a large local FLAPS, I couldn't find the 90W Hypoid. The W stands for winter, so it is a low temp relative viscosity measure. Normal would be 90, for cold temps use 80W. Modern gear oils meet both, hence 80W-90 > While the Bentley states it must meet the MIL-L-2105B standard the > Penzoil DOES state it meets the MIL-L-2105D standard. Would this oil be > compatible? Yes, Mil-L-2105D is the latest revision of the standard. I think even the 2105 standard may be obsolete now, but new oils will still meet it. > It still bugs me that the bottle DOESN'T say HYPOID. I know that HYPOID > stands for high pressure type oil. Hypoid refers to hypoid gears which are offset spiral bevel gears. I guess for some reason they have special lubrication requirements. Since all cars since the 50s use these, such oils are now universal. Gear oils are rated in a GL system. The final drive of an AT uses GL- 5, while the MT uses GL-4. The final drive of the MT would be happy with GL-5 also, but because this oil also lubricates non-hypoid gears in the gearbox section, some compromise is necessary. > Also, I have noticed that the GM Dexron and Ford Mercon oils have > merged! These used to be two separate products, now they are one. > I know I need to use Dexron in the trans on my square, the bottle > of Dexron/Mercon states that "Can be safely used in all transmissions > requiring Dexron built since 1948") So I have to assume this must be > safe. That is correct. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org