Motul 300v Engine oil - revisited. Important. - Triumph Bobber Forum
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post #1 of 37 (permalink) Old 03-27-2019, 04:37 PM Thread Starter
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Exclamation Motul 300v Engine oil - revisited. Important.

As most of you (probably know) I am an AVID Motul 300V oil fan. Been using it for years and years on every bike from racers to Goldwings.

However, my dealer has informed me to now use 10w50 instead of the 10w40 (which is also authorized by Triumph).
The 40 may be too thin and eventually cause a very slow leak as it seeps through certain parts and sensors. No major damage can occur, but it could be an irritating issue to rectify.

Read into this as you will, but i do trust the mechanic and I have now switched to 10w50 Castrol power 1 racing. I would recommend anyone using 10w40 300V oil to change to 10w50, especially as we enter spring/summer.
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Last edited by eisen77; 03-28-2019 at 02:24 AM. Reason: Castrol, not Mobil
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post #2 of 37 (permalink) Old 03-27-2019, 04:47 PM
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Does your mechanic work at a Triumph dealer?
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post #3 of 37 (permalink) Old 03-27-2019, 04:54 PM Thread Starter
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Does your mechanic work at a Triumph dealer?
Yes. And i should add that brands were not mentioned.
As long as I used a thicker (at higher temps) oil - that was the point. I decided to try the Castrol power 1 racing.

Last edited by eisen77; 03-28-2019 at 02:24 AM.
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post #4 of 37 (permalink) Old 03-27-2019, 05:06 PM
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There’s not much viscosity difference between those two oils though, except at the high end of the temp range. So if there is an inherent leakage issue as I perceive you’re implying, it doesn’t seem likely that this is going to fix anything except the absolute most marginal cases. Does that make sense?

For example, if I cannot swim in fresh water then I would probably drown in salt water too, right? There is a density issue for sure, but not enough to make much difference.

Respectfully,

GPz
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post #5 of 37 (permalink) Old 03-27-2019, 05:15 PM Thread Starter
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He printed and showed me the spec differences and took a lot of time to explain the subject to me. The differences are, as was explained to me - enough to cause an issue with the 10w40 300V compared to other 10w40 brands.

I totally understand what you’re saying GPZ and don’t want to scaremonger or start a (usually never ending) oil debate.
Just sharing what was conveyed to me and I will say right now that I’m in no way mechanically inclined and in no educated position to start a debate in this subject.
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post #6 of 37 (permalink) Old 03-27-2019, 05:24 PM Thread Starter
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In short, 300V 10w40 is not recommended for our Bobbers.
I cannot comment on all other 10w40 brands as I can’t compare each one.
But at operating temp, the 300V (10w40) is too thin and may cause issues.
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post #7 of 37 (permalink) Old 03-27-2019, 06:20 PM
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Quote:
Originally Posted by eisen77 View Post
In short, 300V 10w40 is not recommended for our Bobbers.
I cannot comment on all other 10w40 brands as I can’t compare each one.
But at operating temp, the 300V (10w40) is too thin and may cause issues.
Thanks for the heads up Eisen77. It would be interesting to see if the 300v 10w40 would leave a little oil puddle on the floor to be sure, but as you say, if it was recommended, then it probably has been tried and rings true.
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post #8 of 37 (permalink) Old 03-27-2019, 06:30 PM
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Interesting. My bike came with a Castrol sticker. My dealer is multi-brand so I have no idea what they use. The 10 in 10-40 represents the actual viscosity at a specified temperature. The -40 or -50 has to do with its behavior at high temperatures due to its additive package. At least that’s how I learned it in mechanic school many years ago. No idea how hat would cause a leak. I do remember when full synth came out a lot of engines began to leak, including mine.
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post #9 of 37 (permalink) Old 03-27-2019, 09:07 PM
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I no longer work in engineering but I do have a mechanical engineering degree and I've built several high performance engines, including one that produced double its original factory horsepower. So, as you might suspect, I have some pretty strong opinions about motor oils. In the case of my new Bobber however, I'm going to temper my opinions -- which are based on very limited and disparate data -- and choose something made by Castrol. My choice will be in compliance with my owners manual and Triumphs specific advice and their long standing relationship with Castrol.

https://www.triumphmotorcycles.com/o...ecommendations

https://www.castrol.com/en_gb/united...rtnership.html

Knowledge is great. But sometimes the most beneficial piece of knowledge is humble awareness of what you likely do not know.

-GPz

Last edited by GPz; 03-27-2019 at 09:09 PM.
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post #10 of 37 (permalink) Old 03-28-2019, 01:28 AM Thread Starter
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As I said, I can’t debate the issue and certainly appreciate that many of you are a lot more educated than me in this subject.
When I was told of this issue I decided (after some thought) to share it just in case.

@GPz I sent you a PM.
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