Donster

Hi Folks..I have a gallon of amsoil 75/90 synthetic gear lube that I bought about 20 years ago and I am just now getting around to using it. I would like to replace the oil in my tranny with this oil. I have a 5 speed manual transmission. My FSM says to use gl4/gl5 75/90 oil. Any problems with switching to a synthetic oil? The amsoil label says it is good for application of GL2 thru GL5. What about compatability with old tranny oil? Thanks.

waskillywabbit

iTrader: (-1)

20 year old oil?

:wabbit2:

rustypigeon

I would use redline mt90. It is a gl4 which helps your synchros work better than a gl5 would.

snobdds

20 year old has broken down chemically...don't use it.

nightstalker

I have dealt with this issue in the past, i called amsoil and talked to there tech people there, shelf life is 7 yrs ....Max. I hate that, I love me some amsoil

Donster

Thanks for information from Amsoil. I will sell it to my neighbor so he can put it in his "Dodge". LOL. Just kidding.