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Old 07-26-2013, 09:12 AM   #1
whereisgibson OP
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One 7000 mile oil change - an oil analysis

After returning from a long road trip to Nordkapp and Murmansk, the 990 had an oil analysis done.

In a four week period this bike covered near enough 7000 miles, putting it rather far past the recommended 4500 mile interval specified in the service schedule. Given that this happened, and the interest that some have expressed in extending their service intervals beyond 4500 miles outside of warranty, I thought I would share my findings.

The engine was run up to temp, and had a sample pulled from the middle of the dry sump by syringe immediately after.



The bike is a 2011 990 Dakar and had ~33000 miles on it before the trip, and now has ~40000 (~64000km). During the trip I kept the oil level above the max line by about a cm (it's a dry sump so why not) and added just under 1 litre of 10W60 oil in total.

Whilst the brakes, chain, valves, cooling system etc may require additional attention, I'm not concerned that the bike has covered this distance on the same oil.
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Old 07-26-2013, 09:25 AM   #2
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How was the shifting with that many miles on the oil? Seems like at around 2000 miles my 2011 990 starts getting really loud. I'm running Motorex. What where you running?
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Old 07-26-2013, 10:05 AM   #3
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what oil? brand and weight....
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Old 07-26-2013, 06:22 PM   #4
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Good work. Thanks for sharing!

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Old 07-26-2013, 06:29 PM   #5
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I have read somewhere that it is best to keep the oil level just below the full marker. I forget the reason why.
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Old 07-26-2013, 09:09 PM   #6
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I think I have tried every full synthetic motorcycle oil available. Most of the time, it has been whatever is available while traveling. Motul 7100 is a 10-60 but I find that I can cook my oil pretty rapidly and yes shifting gets worse as the oil dies. I recently started using Motul 300V which has a beautiful color when new and has lasted better than any other oil. As for the Price, well I guess you pay for what you get.
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Old 07-28-2013, 11:50 PM   #7
Algarve Nick
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DeepInIt, using Motul, does your bike shift better? My road bike, a Suzuki B-King does. I think people change their oil too often.
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Old 07-29-2013, 02:34 PM   #8
whereisgibson OP
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The oil was Putoline Off Road Nano Tech 4+ 10W60.

Just got the bike back after a service and it sounds pretty much the same as when it had the old oil in, so I'd suggest that the gearbox didn't start to get noisy...

After this experiment I think I'll be moving to 6000 miles per visit.
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Old 07-29-2013, 02:37 PM   #9
whereisgibson OP
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Also no issues shifting gears with the old oil. For what it's worth I mostly shift without the clutch.
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Old 07-29-2013, 09:17 PM   #10
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Interesting, the advancement of oils very recently is huge and one does wonder if the frequencies are too often.

From my perspective we ran 20 - 50 dino oil through Mexico for 5000km and now with the new 15 - 50 Motul fully syn.

The engine was quieter on the dino oil and changed smoother, now she rattles longer and harder when hot on startup with the new fully syn oil that costs 3 time more, one would hope the fully syn is better.

Hmmmmm
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Old 07-29-2013, 10:14 PM   #11
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Thanks for sharing but nothing really to compare the analysis with in the way of specs for a baseline.
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Old 07-30-2013, 05:33 AM   #12
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Quote:
Originally Posted by rossguzzi View Post
I have read somewhere that it is best to keep the oil level just below the full marker. I forget the reason why.
A good rule of thumb is to keep the oil no higher than the full mark. If you fill above the full mark, you can foam the oil.
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Old 07-30-2013, 05:37 AM   #13
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Good advice for a wet sump. But how would it cause foaming in a dry sump motor like the 990?

Elkster88 screwed with this post 07-30-2013 at 05:53 AM
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Old 07-30-2013, 05:41 AM   #14
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If you send your oil out to blackstone in KY they compare your analysis (oil type/ vehicle) to others in their database. A very useful bit of additional information. They also give you a brief written analysis of your numbers.
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Old 07-30-2013, 06:28 AM   #15
whereisgibson OP
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Quote:
Originally Posted by Hodgo View Post
Thanks for sharing but nothing really to compare the analysis with in the way of specs for a baseline.
From their website:


I lost a TBN every 1489 miles, which if dumping the oil at 3.0 extrapolates out to 9529.6 miles. Obviously this is a crude measure but it does suggest that 4500 miles is a bit early.

I'm starting to suspect that it's at 4500 because some engines might manage to burn off all their oil in that distance if it wasn't topped up between a service... (mine wanted 1 litre over 7000)
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