Hello , I know the book of Honda say 10w30 but can you give me advice which oil is better for a MC21 ?
Motul Transoil 10w30 mineral ( Honda book )
Motul Transoil 10w40 synthetic
Honda obviously spec the most suitable grade for a wide range of expected conditions, so a 10W30 is fine for the majority of owners.
However, depending on where you are in Spain, or if you are putting the motor (transmission) under additional load/stress, on track for example, a 10W40 may be beneficial if you consistently experience very hot ambient temperatures.
A synthetic oil is widely considered to be better than a mineral oil, however, for use within the NSR transmission under general riding conditions, it is likely to make very little difference. The oil should be changed every 2 years, and a mineral oil should be quite suitable for this duration.
10W30 and 10W40 are the same viscosity when cold, but the 40 is obviously designed to operate at higher temperature. You may find that the transmission is more "clunky" or notchy with the 10W40 for longer. (Many people experience a slicker gear change when the motor [oil] is hot, which would mean the 10W30 gives a nicer feeling, sooner.)
The short answer... 10W40 synthetic won't do your transmission any harm at all, but you may notice harsher gear changes. _________________ Andy.
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mreebikes wrote:
He says synthetic wears the lay shafts and causes clutch slip..
Synthetic engine oil can indeed cause clutch slip on wet clutch models, however the Motul being enquired about is specifically a transmission oil, and clearly states "...designed for gearboxes with integrated wet clutch using a different oil from engine oil".
We run and recommend Rock Oil GRO, and use it in everything from stock wet clutch NSR250s to the NSR500Vs. _________________ Andy.
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Since the MC21 came out in 1990 Lubricants and Oil technology has come on in leaps and bounds since then. Its fair to say that there would be a big difference in oils in the last 30 years. Do you think this means that we could be over looking a far more beneficial oil for our transmissions? Honda recommended what they had to chose from back in the day. Can we confidently say that Honda would still recommend this oil if they re looked at it?
But, yes, as you say, oil technology has come a massive distance in 30 years, and you will struggle to even find the oil Honda specified. NOS does however come up from time-to-time, and I was lambasted by someone trying to sell some off on here a few years ago for mentioning exactly what you just have!
10W30 engine oil today is not what it was 30 years ago, however Javipop was looking at 10W30 [and 10W40] transmission oil. I didn't mention the GRO in my initial post as [a] the enquiry was about Motul oils, and to say "we use Rock Oil wouldn't be particularly helpful, because [b] Rock Oil isn't generally as widely available abroad as Motul tends to be. It is much more advisable, in my opinion, to use a specific transmission oil these days, as they are specifically formulated to protect against that kind of environment/use.
Oils get better and better literally year-on-year. For those interested, earlier this year API-SP was the latest rating to be introduced. The previous rating, API-SN goes back to around 2011. API is generally less specific than the European ACEA ratings, which should also carry a date on the label. Therefore an ACEA 2019/API-SN is a better specification oil than an ACEA 2018/API-SN, for example. Honda recommended an API-SE engine oil, a specification that dates back to the 70s!
With each iteration engine oils increase in specification, so an API-SN is better than an API-SM, which in turn is better than API-SL for example. This is ultimately more relevant to 4-stroke engines, but the core information is still relevant for all use cases... I wouldn't put an API-SE in my lawn mower! _________________ Andy.
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2T
87-92 Honda Ultra 2 SUPER or Ultra GR2
93-97 Honda Ultra GR2
NSR-WORLD Recommends:* Rock Oil Synthesis 2 Injector or Castrol Power 1 Racing 2T
Transmission
87-92 Honda Ultra U (4T Engine oil, SAE10W-30) or API-SE 10W-30
93-97 Honda Ultra U (4T Engine oil, SAE10W-30) or API-SE, SF, or SG 10W-30
NSR-WORLD Recommends: Rock Oil GRO (Gearbox Racing Oil -- Suitable for wet clutch and dry clutch models)
Suspension
87-88 ATF
89-97 Honda Ultra CO (Cushion Oil) 10W
NSR-WORLD Recommends: Rock Oil SVI 10
*NOTE: NSR-WORLD recommendations are by real world experience, and not sponsored in any way. The above is our recommended alternative to the OEM Honda specifications for standard bikes/applications only.
This is what works for us. I have personally been using Rock Oil exclusively since around 1997. GT Motorcycles/Performance Engineering is a Rock Oil stockist, so I know it's used in all company and client bikes, from the RC30s to the NSR500Vs. I've used other brands with no ill effects, but Rock Oil is the brand I will always prefer and promote. _________________ Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
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