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post #71 of 104 (permalink) Old 11-15-2012, 10:19 PM
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Originally Posted by Speed3 View Post
MCN's Conclusions

In speaking to a number of people involved in the production, marketing and distribution of motorcycle-specific oils, we could not find anyone who could present a valid argument for discrediting the testing done by Dr. Woolum. In general, they all tried to turn the conversation another direction by bringing up other possible advantages to using their products, while ignoring the viscosity-retention question. Yet without exception it is their own advertising that consistently brings the subject up, touting the special shear-stable polymers as the primary reason motorcyclists should purchase their products.
It is this practice to which we take exception, as we have been unable to find evidence to support these claims. In short, it seems to be nothing more than a clever marketing ploy designed to enhance their products' image and separate motorcyclists from their money.
MCN is ready to print any research or test results provided by the oil companies to support their claims of superior viscosity retention, with this one proviso: The comparisons must be against actual, SG-rated oil products that can be purchased off the shelf at the average auto parts store. Tests against generic, basic-stock mineral oil or against the lower-rated SE and SF oils would lack any credibility in a real-world context. Despite more than six months of research, reading all the claims and counter-claims printed by dozens of industry experts and lubrication experts, MCN cannot and does not purport to know all there is to know about the differences between automotive and motorcycle oils. However, what we do know is that we can find no substantive evidence that using a high-quality, name-brand automotive oil in an average street motorcycle is in any way harmful or less effective in providing proper lubrication and protection than using the more expensive, motorcycle-specific oils.

Whole article here http://www.ducatimeccanica.com/oil.html
Don't know who Dr. Woolum is nor am I familiar with his supposed research but, if talking viscosity retention, that is not what is at issue here in my opinion. I'm far more concerned about the friction modifiers in automotive oils being used in wet-clutch applications. This article does not address this at all. The article also incorrectly states that the claims are only made by the oil companies that stand to profit, this is totally false. All motorcycle mfgs that I've seen specifically state to use motorcycle specific oils in their bikes. Granted, I have not seen all mc manuals and I have not looked at at the recommendations for a Ducati with a dry clutch, but I assume for dry clutch bikes it shouldn't matter what oil you use.
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post #72 of 104 (permalink) Old 11-15-2012, 10:29 PM
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I can tell you from using Mobil 1 15/50 car oil, that it doesn't make my clutch slip. Don't know about other brands. Like I said, do some research, and form your own conclusions. I know I'm not paying 50 bucks for 4 qts of oil.
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post #73 of 104 (permalink) Old 11-15-2012, 10:31 PM
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Rather than going through 7 pages of (no doubt entertaining) posts, I'll just say this here. It is not just the wet clutch that is my concern regarding oils with 'friction reducers'. Reducing friction also reduces shear strength, and the oil will not possess sufficient film integrity to protect the transmission - which (as I'm sure you all know) shares the oil with the powerplant.

IMHO, this is an even more relevant issue than is the clutch.

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post #74 of 104 (permalink) Old 11-16-2012, 04:22 PM
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Surprised it took so long for someone to bring that up, because frankly protecting the gearset is vital in a motorcycle oil, and it's not a concern in a car.

At least for me, I run 15w50 year round, even though I've ridden in 8*F weather (forget how many below 0C that is for you metric chaps). My bike simply does not like the lighter oil and shifts poorly and feels rougher. My triumph mechanic said that for most people who actually ride their bikes a lot of miles and beat on them, the 10w40 oil should only be used outside of break in if you're riding in severe cold where the heavier oil simply won't work, and I can buy that.

As for Rotella, I've used it in a variety of bikes, and my experience says that bikes under 115hp (600's, sv650, etc) seem to like it very well. My hayabusa didn't seem to care for it, and neither did the triumph. Both of them started shifting like **** very quickly on rotella (gears, not clutch slip, that was fine) and were fine once I went back to my normal oils.

Of course the plural of anecdote isn't data, YMMV, etc.

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post #75 of 104 (permalink) Old 11-16-2012, 04:47 PM
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I don't think Synthetic 15/50 is going to shear to dangerous levels with 3-4,000 mile oil changes. It hasn't affected my bike in any way. Shifts fine and doesn't burn a drop. It comes down to personal preference. Use what you think is best in Your bike.

Last edited by Speed3; 11-16-2012 at 04:50 PM.
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post #76 of 104 (permalink) Old 11-16-2012, 05:45 PM
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Has anyone tried Royal Purple's motorcycle oil and if so what did you think?

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post #77 of 104 (permalink) Old 11-17-2012, 09:42 AM
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?????????? Triumph sayas 10-40 or 20-50 5-40 is a little thin at start up?
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post #78 of 104 (permalink) Old 11-17-2012, 09:52 AM
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According to oil "experts", even 0W is too thick at start up, especially in the cold. You want a thin oil for start up. But, the reality is what the manufacturer recommends and what is generally sold in the market. As has been previously mentioned in older oil threads, oil wgt ratings are not the same from brand to brand. They can vary quite a bit. I've used all sorts of oil and haven't killed a car or bike engine yet. Use what you like as stated by others is the way to go.
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post #79 of 104 (permalink) Old 11-17-2012, 12:45 PM
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Talking off track?

This should probably be on a new thread but since the readers are so into this one, and since it went screaming off track so quickly anyway thought I'd just tack this up here. Does anyone really know why there are so many oil weights availible in todays market anyway. Not talking "motorcycle only" or "car only" here just viscosity. I think it's marketing. Except for older engines with so called "flat tappet" designs that need higher levels of ZDDP, all new engines seem to have pretty darn close to the same tight running clearances. Does oil pump design and running clearances have something to do with it? After all this is the component that "sees" the oil first and is responsible for maintaining an oil pressure somewhat over engine requirments at high speeds (controlled with bypass). I wonder if we'll ever see variable speed electric pumps? No bypass required with these and a short delay before ignition would prime the engine.
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post #80 of 104 (permalink) Old 11-17-2012, 01:29 PM
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Originally Posted by exlimeydedbt View Post
?????????? Triumph sayas 10-40 or 20-50 5-40 is a little thin at start up?
Not in either of my owner's handbooks?

Interestingly, Triumphs oil partner "Castrol", does recommend 5W oil as a 3rd alternative in the Speed Triple.
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