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Most people know the difference between picking up a 5lb weight vs a 10lb weight. Going through a rigorous scientific process to prove that one is heavier than the other is not needed.

I was thinking of trying our equivalent of Rotella (Rimula) after hearing so many people love it in theyre bikes. What grade were you using? I hear the 5w40 shears down much quicker than the 15w40 in shared sump bikes.

It was their fully synthetic Synpower 4T. Seems like others have had similar experiences with Valvoline and Castrol as me, when used in single cylinder shared sump bikes. I purchased some 15w40 motorcycle specific oil. I'll report back my findings. Hopefully it doesn't shear down as quick.

That all makes sense. However, my current bike is only 3 weeks old, is on its second oil change, has 700 miles on the clock, and is behaving in the exact same way as my previous 8 bikes, in regard to the shifter becoming stiffer and stiffer over the oil life when ridden aggressively. None of my...

There are some truck oils in the UK that have the Allison c3 designation. Do you think these will be worth a try? No additives or anything that might not be suitable for a motorcycle?

Yes exactly this. It's 100% oil related. A clutch doesn't magically become correctly adjusted when you change the oil. That's assuming it was out of adjustment in the first place, which I keep on top of. One of my previous bikes (klx250) used flat tappets instead of roller rocker's, and I had...

Yes, but again, what you're saying does not apply in this case. The fact of the shift lever gaining stiffness over an oil fill is not up for debate. It IS a real thing. It is just as measurable as a large rock is measurably heavier than a small pebble. I have direct experience of it over many...

I think maybe you misunderstood my original post. I've been riding for nearly 20 years now, the last 10 on road-legal dual-sport/trail bikes, and before that, exclusively off-road on enduro bikes. I'm a very aggressive rider, and the observation of the shifter becoming steadily stiffer over the...

I'm well aware that people are easily fooled, subjected to the placebo effect, and swayed by their feelings. But that simply doesn't apply in this case. I'm not talking about a slight change in shift feel. I'm referring to it becoming physically difficult to pull up the shifter to the point...

Thanks I can only find 15w40 part synthetic though. Do you still think it will last longer than fully synthetic 10w40?

I cant recall ever using Mobil. Its always been more expensive than the competition. I'd be interested in trying a 15w oil although, but it will probably be a 15w40. Because when I switched form the 10w30 to the 10w40, I noticed a slight dulling of the power, it didn't feel quite as free running...

Its always been the worst oil I've used unfortunately. This was consistent over a couple of different bottles, bought years apart. Shame really, because it's always available over here at Halfords, and can sometimes be gotten on offer, that's how I've ended up with it in the past. I don't doubt...

Hi all. So I've owned many trail bikes over the last 10 years, and I generally ride them very hard, mostly off road. I change the oil when the shifting becomes too difficult, and gear changes are missed. At this point it feels like there is a lot of friction on the shift lever. But once the oil...