[T3] Gear Oil Choices

[Allen Moore <concept@compassnet.com>]

While I am going to be replacing the rest of the fuel lines this
 weekend (another go around with "A Saturday afternoon, a Lift and 
 a Type 3!") 

 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.

 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.

 When I went to a large local FLAPS, I couldn't find the 90W Hypoid.
 There were 75W-145W, a few 75W's and then Penzoil "4096" 80W-90W gear
 oil.  The Bentley states that a HYPOID SAE 90 should be used.  In 
 cold climates 80W Hypoid can be used.  I am in Texas, so I figured
 the 90W should be used. I couldn't find it.  The Penzoil is the 
 closest match.  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?  Thinking in military terms, I am
 assuming that the 2105 standard has been revised twice and this
 80W-90W oil should measure up.  It still bugs me that the bottle DOESN'T
 say HYPOID.  I know that HYPOID stands for high pressure type oil.
 
 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.

 Can anybody shed some light on this subject?

 Thanks in advance...

 Allen 
 70' Square 
 Houston, TX 

 
 Can anybody shed any light on what is the correct oil for the rear
 drive section of my 1970 Square with Automatic?

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