Bernie,

I switched to Redline MT 90 for my 88 GL manual tranny 5 years ago. It
relieved a number of problems I was having, and has perform admirably
since. I do however, change it out every tow years as part of my
maintenance plan to keep my van alive as I am. We both  are on a
rigorous maintenance program. While common practice is to just keep on
running the tranny and never drain the things, I believe that to get the
longest life out of the tranny, regular changes of oil are necessary,
just like changing engine oil. GEts rid of metal particulate that floats
around in the oil, wearing on the surfaces of th e gears. Magnets help -
but they don't get it all. Besides that, oils are comprised of long
chain molecules and these get broken up over time, and the lubricating
qualities are lost as a result. It makes sense to replace the worn out
oil periodically. And the tranny is a pretty harsh environment for that
oil, those long chains being constantly crushed between gears and other
parts. Small wonder they get broken up.

Bernie wrote:
> Is 75W90 the right weight for Redline gear oil in the vanagon.Thank you,
>
> Bernie
> Vancouver
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