What oil to use for amazon gearbox?

[pez]

Just wondering whats the correct type of oil to use in the amazon gearbox?
Ive read different things,from ATF to normal engine oil 20/50.
Im just confused what is correct!
Anyone advise on this please?

Cheers

Ben

[CLIVERALLY]

20/50 ..I would not use ATF in the gearbox..stick that stuff in the carb dash pots :-)

[Dibble]

Originally Posted by pez

Just wondering whats the correct type of oil to use in the amazon gearbox?
Ive read different things,from ATF to normal engine oil 20/50.
Im just confused what is correct!
Anyone advise on this please?

Cheers

Ben

20/50 engine oil as recommended.

[pez]

Cheers for the advice lads
Much appreciated

[swedishandgerman]

Originally Posted by pez

Just wondering whats the correct type of oil to use in the amazon gearbox?
Ive read different things,from ATF to normal engine oil 20/50.
Im just confused what is correct!
Anyone advise on this please?

Cheers

Ben

Please could you say what gearbox you have? It's just that M40 4-speed is gear oil - EP80/90 GL4 upwards is good - and M41 over-drive is engine oil.

This is just Adam theory, but I would recommend using something like Millers Pistoneeze (SAE30 or 25/50) because modern engine oils contain detergents and surfactants which "swell" particles so that they get caught in a good quality oil filter. There's no oil filter down there in the gearbox, so these "swollen" particles go round and round and round. That's for M41, BTW.

[pez]

Sorry should have said its the m40 4 speed box non overdrive in my amazon estate.

Cheers

[Clan]

Originally Posted by pez

Just wondering whats the correct type of oil to use in the amazon gearbox?
Ive read different things,from ATF to normal engine oil 20/50.
Im just confused what is correct!
Anyone advise on this please?

Cheers

Ben

as per later models , ATF was the factory oil unless you have Overdrive when it was engine oil . so you can use either in a Non OD gearbox . This goes right on to the 240 series with M40/ 41

[Ron Kwas]

Guys;

See discussion on same subject at Swedespeed: http://forums.swedespeed.com/showthr...-Rear-Axle-Oil

Cheers

[c1800]

Hi, I don’t think that for the 120 or 1800 series ATF was ever specified. Later models may have ATF specified however.

Lots of discussion on the various forums.

Some general comments based on my reading the various forums and some owner/service manuals.

M40 can use engine oil, either 30W or 20W40, or 20w50, since I haven’t seen 20w40 for some time. Some early manuals specified 30W non-detergent oil. There appears to be no information as to why non-detergent makes a difference. (Although I see Swedishhangermans comment posted earlier today). M40 can also use NON-HYPOID gearoil 80w90 or similar. Extremes of temperature can dictate a lighter or heavier gear oil. Another option is Redline MTL, which is specified by redline for m40/41 and is supposed to be superior to others for easier shifting etc.

I’ll be trying MTL on my next trans oil change.

Edit: I see Ron has provided (while I was composing) one of those discussions.

[Pigeon]

Per the green book, SAE80 without overdrive, SAE30 with.

For the SAE30 there is also a parameter "Quality" specified with the value "For Service". I don't know what that means. For the SAE80 only the viscosity is specified.

The "non-detergent" requirement is for SAE30 in overdrive boxes, to stop it foaming and squirting out of the breather. This also happens if you overfill it. You know it's happened because it squirts onto the exhaust pipe and you can't see anything in the mirror any more.

I thought I'd gone to an MZ forum by mistake for a moment! This is a common point of discussion for MZ owners because it makes a big difference to the gearchange and nothing is really satisfactory so everyone has their preference. But the book spec works fine for an Amazon so it never occurred to me that anyone would not just follow it.