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Old 8th July 2008, 09:34 AM   #1 (permalink)
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R35 - Using gear oil as TM oil

I know of a few owner has replaced the TM oil with 75W-140 gear oil, for the sake of lower gearbox noise. So far the only noticeable setback is a higher TM oil temp, can anyone one shed some lights on this ?
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Old 8th July 2008, 10:47 AM   #2 (permalink)
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Errr... have you compared how different the viscosity of the transmission oil is from the diff/final drive oil??
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Old 9th July 2008, 12:00 AM   #3 (permalink)
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I have not personally seen the TM oil but was told by the mechanic that the R35 TM oil are pretty low in vicosity, probably close to TM oil used in a typical auto trans, definitely far from differential oil.
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Old 9th July 2008, 02:04 AM   #4 (permalink)
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Yeap. TM oil is almost like engine oil.

In any case, why not use the original Nissan TM oil?

I know even tuning houses like Amuse/MCR use original Nissan TM oil, even if they change the diff/final drive/engine oil to other brands.
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Old 9th July 2008, 02:18 AM   #5 (permalink)
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So far the only noticeable setback is a higher TM oil temp
tm oil temp is the r35's achilles' heel. why would these guys risk higher temp and potential failure to reduce (minor) noise? which workshop? how much higher is tm oil temp now for street and for track?
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Old 9th July 2008, 02:39 AM   #6 (permalink)
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if the tm oil temp is the achilles heel, how to solve that? are there oil compositions which can stand the higher temp better? work better at lower temps?
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Old 9th July 2008, 02:42 AM   #7 (permalink)
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tm oil cooler. not available yet

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if the tm oil temp is the achilles heel, how to solve that? are there oil compositions which can stand the higher temp better? work better at lower temps?
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Old 9th July 2008, 03:21 AM   #8 (permalink)
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Yeap Zele/Harrison has one in the works



Wonder how much cooling you can get in the back next to the rear exhaust outlets
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Old 9th July 2008, 06:13 AM   #9 (permalink)
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Was told the TM oil temp went up as much as 10 - 15°C, for road use I think its fine but for track I dunno. For zele's oil cooler I think they installed it at the "Hot" spot of our R35, wonder if it helps on oil temp. BTW where to get R35 TM oil in Singapore ? This workshop has another theory, 50% of 10-50 + 50% of 0-30 gives you 5W-40 oil, buy it ?
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Old 9th July 2008, 06:36 AM   #10 (permalink)
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Was told the TM oil temp went up as much as 10 - 15°C,
when fresh from a tm oil change, i hit about 109 on the nsh and 126 on track. have seen other 35 going _above_ 130. safety limit is 140. so, what do you think ? insane
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Old 9th July 2008, 06:45 AM   #11 (permalink)
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where to get R35 TM oil in Singapore ?
pm'd u the sources. easily available
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Old 9th July 2008, 07:02 AM   #12 (permalink)
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Thanks, replied your pm.
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Old 9th July 2008, 09:13 AM   #13 (permalink)
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Thought safety was 130 - someone I know tracked monday and his car went to safety mode at 130.
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Old 9th July 2008, 09:42 AM   #14 (permalink)
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Thought safety was 130
nah. yellow/red zones are above 140. like i said, tm oil temp is the weakest link. so set the large dial on screen 1 to read it. back off when it reaches mid 120s.
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Old 10th July 2008, 01:18 AM   #15 (permalink)
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Thought safety was 130 - someone I know tracked monday and his car went to safety mode at 130.
Mea culpa - it wasnt the TM temp - which was 133 and not in the safety zone, but the engine oil temp which touched 130.
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Old 10th July 2008, 05:46 PM   #16 (permalink)
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tm oil cooler is needed! the nismo R35 and the Spec-v should have one of these. i have heard early on that nismo would release one of these too. so we will see if they do. in any case, i think others are working on these too, but zeal is the only one right now that is publicly shown. well, not really for a stock R35, but for any power increases. other than that, stock is just fine unless heavy track use.
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Old 15th July 2008, 08:04 AM   #17 (permalink)
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tm oil cooler is needed! the nismo R35 and the Spec-v should have one of these. i have heard early on that nismo would release one of these too. so we will see if they do. in any case, i think others are working on these too, but zeal is the only one right now that is publicly shown. well, not really for a stock R35, but for any power increases. other than that, stock is just fine unless heavy track use.
I looks like NISMO has an oil cooler on their car already, based on several tuner pics from the Tokachi 24-hour build-up.
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Old 21st May 2019, 05:01 AM   #18 (permalink)
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An old but interesting thread.

Is there any oil that could be used for the transmission and the differentials? The reason I ask is that I am planning to fit a cooler for the transmission and another for the two differentials. Having a single cooling circuit for all three components would have design advantages (reduced parts, weight, complexity, normalisation of temperatures etc), but only if they could all share the same oil...

A single circuit doesn't have to mean a single cooler, two or more could be fitted, but it would only require a single heavy-duty pump.

The thread started with the notion of using gear (diff?) oil in the transmission, which I believe normally uses a much thinner oil. Is there perhaps an oil viscosity somewhere between the two that could make for a suitable compromise?
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Old 27th June 2019, 07:32 PM   #19 (permalink)
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I know of a few owner has replaced the TM oil with 75W-140 gear oil, for the sake of lower gearbox noise. So far the only noticeable setback is a higher TM oil temp, can anyone one shed some lights on this ?
You cook!ng idiot!
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