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10w40?

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Pete 86 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pete 86 Quote  Post ReplyReply Direct Link To This Post Topic: 10w40?
    Posted: 27 Apr 2020 at 12:15
Manual says 15w50 .
So why do i see 10w40 reomended for the Vtwin?

Viscosity with temp i know.
So which is better?

Ill proably find a thread on here somewhere sorry for being lazyApprove

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legend88 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote legend88 Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2020 at 12:53
Loads of threads on here about oil choice, take your pick.  Big smile

My take on it is that for a big V twin like these with larger mass parts moving around, the heavier weight oil helps to maintain the oil layer between moving parts. The most important thing that an oil does inside an engine is to maintain an oil barrier between components to keep those components apart. That's why oil pressure is so important as it's the pressure that maintains the oil barrier. It's much more important than the lubrication itself.

Many use 10W40 and report no problems but it's over the long term that these things manifest themselves and then how do you prove the cause of any failure? Only by extended comparative testing which only the oil companies and the manufacturers do.

I use Motul 5100 15W50 and always have.

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Spoonz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Spoonz Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2020 at 12:53
Either or. Some brands of oil didn’t do a 15W50 so that has more to do with it than any benefit from the different viscosity. 
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Ice-mille View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ice-mille Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2020 at 16:13
10/50 works top, lots of brands.
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Stevex View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stevex Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2020 at 17:43
Depends on who's doing the recommending; 15w/50 all the way here.

People say I don't know Jack Sh1t; but I do, he lives next door.
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