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Maxima MTL transmission oil-1973 Yamamaha RD350 #4562743
11/03/17 07:06 AM
11/03/17 07:06 AM
Joined: Nov 2017
Posts: 6
NB Canada
Alain2 Offline OP
Alain2  Offline OP
Joined: Nov 2017
Posts: 6
NB Canada
1973 Yamaha RD350 2 stroke engine. Yamaha recommends 10w30 motor oil for the gear case. Now most car oil 10w30 have additive the 70s oil didn't have.

Instead of a motorcycle specific 10w30 oil, what about using Maxima MTL transmission oil, it comes in 75w(XL), 80w(R) and 85w(E).

Which one would be the equivalent of the 10w30? 80W?

SAE Grade MTL-XL MTL-R MTL-E
SAE Viscosity 75wt 80wt 85wt
Color D1500 Honey Honey Honey
Viscosity cSt @ 40C D2270 31.63 63.45 89.29
Viscosity cSt @ 100C D2270 5.54 8.57 10.66
Viscosity Index D2270 125 125 135
Flash Point C D92 425 465 500
Pour Point C D92 -15 -12 -10

Re: Maxima MTL transmission oil-1973 Yamamaha RD350 [Re: Alain2] #4562807
11/03/17 08:51 AM
11/03/17 08:51 AM
Joined: Oct 2004
Posts: 3,079
Midwest, Illinois
beanoil Offline
beanoil  Offline
Joined: Oct 2004
Posts: 3,079
Midwest, Illinois
You could, MTL is fine for a 2t gearbox.
Ford F fluid is as well.
I ran a lot of Shockproof Light in the MX bikes, that's another option.


beanoil: Tough under heat, real dirty afterwards.
Re: Maxima MTL transmission oil-1973 Yamamaha RD350 [Re: beanoil] #4562814
11/03/17 09:03 AM
11/03/17 09:03 AM
Joined: Nov 2017
Posts: 6
NB Canada
Alain2 Offline OP
Alain2  Offline OP
Joined: Nov 2017
Posts: 6
NB Canada
I know it is fine, but I was curious to know the WT equivalent of 10w30.


Ford F fluid is interesting, I think the Yamaha Banshee crowd uses that. That being said, I would use Castrol GTX 10w40 before Ford transmission oil!

Re: Maxima MTL transmission oil-1973 Yamamaha RD350 [Re: Alain2] #4562835
11/03/17 09:50 AM
11/03/17 09:50 AM
Joined: Aug 2004
Posts: 4,646
Katy, Republic of Texas
blupupher Offline
blupupher  Offline
Joined: Aug 2004
Posts: 4,646
Katy, Republic of Texas
according to this chart, a 30 wt oil is equal to a thick 80 to 85 wt gear oil.

Last edited by wwillson; 11/03/17 07:30 PM. Reason: fix URL
Re: Maxima MTL transmission oil-1973 Yamamaha RD350 [Re: blupupher] #4562883
11/03/17 10:52 AM
11/03/17 10:52 AM
Joined: Nov 2017
Posts: 6
NB Canada
Alain2 Offline OP
Alain2  Offline OP
Joined: Nov 2017
Posts: 6
NB Canada
perfect, thank you for the link

Re: Maxima MTL transmission oil-1973 Yamamaha RD350 [Re: Alain2] #4563217
11/03/17 05:59 PM
11/03/17 05:59 PM
Joined: Jul 2003
Posts: 4,755
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,755
New Zealand
A straight 30 would also be pretty close.


1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Maxima MTL transmission oil-1973 Yamamaha RD350 [Re: Alain2] #4563269
11/03/17 06:57 PM
11/03/17 06:57 PM
Joined: May 2005
Posts: 165
near Montreal, Canada
mlatour Offline
mlatour  Offline
Joined: May 2005
Posts: 165
near Montreal, Canada
Motul makes a 10W-30 gearbox / wet clutch safe lubricant,
Transoil 2T looks to be a mineral and is mostly marketed for dirt bikes.

They also offer a synthetic, Transoil Expert 10W-40.

Myself have tried every imaginable lubricant in my YZ125 motocross gearbox,
from thin Type-F to thicker Rotella T 15W-40 and everything in between.

Have now settled on Motomaster 10W-30 Semi-Synthetic Diesel engine oil (likely Rotella T5 re-badged),
not JASO rated but has not shown any signs of slippage in 3 dirt bikes I run it in.

In all that I've ran, it's actually the oil that retains the best shifting qualities the longest.

Last edited by mlatour; 11/03/17 07:02 PM.
Re: Maxima MTL transmission oil-1973 Yamamaha RD350 [Re: Alain2] #4563480
11/03/17 10:55 PM
11/03/17 10:55 PM
Joined: Sep 2015
Posts: 5,868
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,868
Kalifornia Kollective
Redline MTL (manual transmission Lube) will give you a whole new feel. Shift quick and slick. I pour it all the manual gearboxes (except heavy trucks - cost ...) cause it works so well smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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