I'd rather not try to do my own long term oil analysis. Other people's data and experience will provide a better guide now. I might send my oil off anyway, but I don't get the idea that the data includes OCI recommendations, or how well the oil is still working. More about metals in the oil which is a bit indirect.
For those interested in the small details, the wet clutches like those in our bikes actually slip continuously. It's a very small amount, but the drive and driven plates are in constant motion relative to one another. That alone puts a small amount of wear on them, but indeed that alone would take a _very_ long time to wear them out if you don't purposely slip them much and ride mostly on the highway (so you're not starting from a stop or shifting much).
Another small detail is that _many_ people use the term "friction modifier" incorrectly. Generally I find that people mean friction _reducers_ when they say modifiers. In fact, friction _modifiers_ are regularly and normally used in JASO MA oils. They _modify_ the frictional characteristics of the fluid such that it will meet the MA spec (or one of the sub-parts). Without friction modifiers, the fluids would generally be unsuitable for wet clutch use.
Last edited by MZ5; 12th June 2019 at 17:54.
I going with the the theory Honda did all the research...........then Honda choose OCI with a large safety margin.
Long term oil analysis and development of trend line would take the bike’s entire life and then might not have enough data to make a conclusion. Not mention the cost .........
Companies that do oil analysis typically make their OCI recommendations using data extrapolated from thousands of similar samples sent in by customer that have collectively covered millions of miles together with the specific results from your own sample.
Measurements include current viscosity, % of fuel and coolant in the oil, % of water, etc, and between 20 and 25 different elements (measured in PPM) including metals used in bearings. For example: an increase from say, 10 ppm of copper (a bearing material) to 50ppm indicates serious wear.
An engine's oil can be considered the "blood" of the engine, and the benefit is that an analysis can act as an early warning system alerting you to potential problems. Every large fleet owner does periodic oil analysis and it is required in some industries. We had a spectrometric oil analysis done periodically on all our aircraft engines for these reasons.
Personally, I think the real advantage of the analysis for most consumers is that it is the only reasonable way to determine if the oil in your engine is still "good to go" for thousands of more miles and is not contaminated. The advantage for commercial fleet owners is more about reading the results to determine engine wear and potential failures, and not necessarily about extending OCIs.
Last edited by ld_rider; 13th June 2019 at 15:30.
Rob in New England
Iím usually an annual oil change guy because I donít hit the 8000 mile mark in a year. I have seen a number of oil reports (on here and on Bob is the Oil Guy website) that shows that the oil still has life in it after 8000 miles. I havenít seen any reports from people stretching it beyond 8000.
If I knew I was taking a long trip I would use a quality synthetic oil and not worry about going over 8K to maybe 10K miles. Otherwise, Iíll save a few dollars and use whatís on sale. I currently have Honda GN4 in the crankcase now. Reports show that even the Dino GN4 still has life after 8000 miles.
I've been changing oil in my Vulcan Nomad with cheap conventional oil every 3-4k miles, but that's only because it seems to use a little bit and I don't want to stretch it too far and it get low before I notice it. Easier to change it and refill to normal level. Doesn't leak or smoke, just usually comes out a little shy of what I put in it, also factoring in what's left in the filter.
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I've ordered a Blackstone test. I didn't realize it, but for an extra $10 they do an additional TBN test that measures the level of additives still left in the oil. This is an indirect measure of probable oil life and they then will recommend a change interval in general terms. Hopefully just a one time test will set reasonable parameters going forward. I'll post the results but it may be a month or two before I get it, depending.
I'd still be interested of course in the experiences of anyone with extended oil change intervals on the NC.
It'll be interesting to see your analysis; please post it.
And while you're at it, please disregard Blackstone's commentary section. That seems to be an attraction for many of their customers, but the comments themselves are frequently _so_ far off the mark it's just ridiculous.
I doubt I posted it here, but these are the results from a 10k-miles analysis of mine in late 2015, with about 35k total on the bike at that time.
Visc (100C) 8.9 cSt