Gearbox oils landrovers

Submitted: Saturday, Jan 21, 2006 at 19:27
ThreadID: 29960 Views:1604 Replies:3 FollowUps:2
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Wondering if someone could enlighten me on why such a light oil is recommended for the defenders main box (5 speed manual) Basically auto trans oil. Is it a heat related thing ?, Surely 80w90 gear oil would lubricate better. Or would that be to heavy to splash feed top shaft and gear where there a bit vunerable .
Regards Axle
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Reply By: Shaker - Saturday, Jan 21, 2006 at 20:10

Saturday, Jan 21, 2006 at 20:10
Probably something to do the synchromesh, Mercedes Benz have used basically ATF in their manual gearboxes for years. It is also an instant fix for earlier Hondas that were crunching 2nd on down shift, change to ATF!
I would suggest that you don't try to second guess the manufacturer when it comes to oil recommendations, lets face it they've been building Land Rovers since 1947.
AnswerID: 150050

Follow Up By: Shaker - Saturday, Jan 21, 2006 at 20:11

Saturday, Jan 21, 2006 at 20:11
Sorry, my typo, first phrase should read ...... Probably something to do with the synchromesh ................
FollowupID: 403434

Follow Up By: Axle - Saturday, Jan 21, 2006 at 20:39

Saturday, Jan 21, 2006 at 20:39
That makes a lot of sense , they are a beautiful smooth box to change with hot or cold. Its just that red oil doesnt feel like it would lubricate .
Have had no probs in 150.000 km , so better leave well enough alone.

Thanks mate

ps hope everything goes ok with fires.
FollowupID: 403437

Reply By: garrycol - Saturday, Jan 21, 2006 at 21:32

Saturday, Jan 21, 2006 at 21:32
ATF is no longer the recommended oil for landrovers - now MTF94 - changed in about 1998. Castrol Syntrans also works well. The lighter oil makes for smoother changes when cold and is suitable for use in the internal oil pump contained in the gearbox. This pump may not be able to pump heavier grade oils, particularly when cold.

AnswerID: 150056

Reply By: kesh - Sunday, Jan 22, 2006 at 07:40

Sunday, Jan 22, 2006 at 07:40
Garry is absolutely correct. Whe th Defender first came out it was sold more in the "agricultural" areas of ozz and for a while L/R were inundated with blown gearbox problems (a friend of ours blew up at 9000km.)
The cause, mechanics (not L/R) were filling the boxes with 80/90 oil which the internal pump would not circulate.
My 97 Disco has 180000km. beautiful gear change and has always had ATF (actually, never been changed or added to!)
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