AMSOIL synthetic 75/90 Gear lube in manual 5 speed transmission

Reply Subscribe

Thread Tools

Search this Thread

Dec 26, 2012 | 11:22 AM

Donster

Thread Starter

Registered User

Joined: Dec 2012

Posts: 47

Likes: 0

From: East Mountain area of Albuquerque, New Mexico

AMSOIL synthetic 75/90 Gear lube in manual 5 speed transmission

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.

Dec 26, 2012 | 11:51 AM

waskillywabbit

Banned

iTrader: (-1)

Joined: Jul 2003

Posts: 3

Likes: 20

20 year old oil?

:wabbit2:

Dec 26, 2012 | 12:19 PM

rustypigeon

Registered User

Joined: Jul 2006

Posts: 617

Likes: 4

From: PA USA

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

Dec 26, 2012 | 12:48 PM

snobdds

Registered User

Joined: Nov 2008

Posts: 2,306

Likes: 8

From: Cheyenne, Wyoming

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

Dec 26, 2012 | 04:29 PM

nightstalker

Registered User

Joined: Jan 2011

Posts: 288

Likes: 0

From: newnan georgia

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