16 replies to this topic

[adgjl7]

hi was wondering what oil is best to use in the m21. just had one rebuilt and would like to get it right thanks

[Dodgey]

This is my preferred oil.

 

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[lx308]

75/90 is what I've been advised to use also.

[adgjl7]

Thanks for your reply . ill go lookin tomorrow if I have time does repco sell it thanks again

[grumpy xu1]

No royal purple @ repco, autobarn is a stockist mate. Gary.

[hanra]

Box n diff

[grumpy xu1]

The liquimoly oil is 75w 90 for the transmission & 85w 90 for the differential both full synthetic & roughly the same price, royal purple USA made, liqui moly German made. Auto barn is the dealer for both. It's not cheap though i will promise you that. Don't be surprised to pay up to $200 for the oil for Trans & diff. But it would be what I'd use, gearbox can be easier to shift just with better oils, i will leave it at that. Gary.

[LJ RB30]

Box n diff

 

Reco'd the 3 speed in the Nanna Torana & put VMX in it cose i had some.

 

Was talking to an old mate a couple of days later about doin the box & using VMX.

 

His first comment was "GET THAT SHIT OUT OF IT!"

 

It will leak out of almost any gearbox! he said

 

Then i said that the box didnt leak before & its sealed up good so she"ll be right!

 

WRONG!!

 

It decided to leak out of the selector shafts & somewhere else that i cant remember now

 

Old mate said he has seen many a good box leak with that shit in it but when you replace it with ANY oil other than VMX & of the same viscosity it magically cleared up!!

 

I put Castrol 80-90 in it now & shed floor is dry!

 

My 2 cent anyway

[rexy]

I have used the Castrol VMX for a long time in all the Toyota boxes in the various cars - steel case celica, w series supra and r series supra. None have ever leaked. Very nice shift feel too.

[LJ RB30]

Think its what i ran in the supra box too with no issue.

 

Aussie 3 spd didnt like it

 

Old mate hangs around vintage regularity guys & has seen issues with VMX

[grumpy xu1]

If you were interested in the liquimoly the numbers & capacity are as follows engine oil part # 1212 5,litre bottle service refill is 3.4 litres.
M20 ect part # 4434 1,litre bottle service refill 1.9 litres.
Differential part # 1410 1,litre bottle service refill 1.4 litres.
Gary.

[IanC]

I bought some Royal Purple max gear oil for my gearbox. I meant to get 75/90. But I got 85/140 by mistake. Should I take it back and get the 75/90 ?. Cheers guys.

[RallyRed]

Thinkin' 140 is too heavy mate.

[dron]

Lighter the better, If you can keep it in there. Trick from years ago was to put Dex 2 in them to improve gear shift speed. The scrincos would never cope with 85/140. I would use a synthetic 75/90 or lighter rather than any older type oil, Lighter for the scrincos but still rated for a gearbox.

[RallyRed]

Hi again,
When I was pondering Aussie 4 speed oil I noticed this on tbe Penrite webpage for "1972 XU1" gearbox oil.
At the time I was about to use their synthetic gearbox oil. Anyway, I rang them/ web chatted to ask why " no substitution allowed!"?. The oil guru advised that these gearboxes have some bronze type bits in them, and THIS is the correct oil.
We did run the synthetic for a short time before this, but swapped back to the mineral 80w - 90.
Also of some interest, we have had race Aussies refreshed by 2 different experts and both say 80w - 90 MINERAL is the go for Aussie 4 speeds.
Others may have different opinions.

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Edited by RallyRed, Yesterday, 04:53 PM.

[IanC]

Thanks Col. I use penrite in my motorcycle with full confidence. I have read that royal purple is pretty special. I ordered through supercheap. I have surched their Web pages, they seem to carry every royal purple oil except 75/90. Happy to go back penrite.