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So, my buddy and I were trying to figure out which oil would work best for our Gen.4 ZX-10Rs in regards to clutch perfomance and the motor. I typically use Mobil 1. But recently, multiple vendors and companies that make clutches (which I have been calling around to because I need a new one lol) have recommended Amsoil 10W-40 synthetic motorcycle oil. I've heard the ole' "oil is oil" debate. But, I've also heard that the little things in each brand of oil really make a difference.

So, what do I decide to do? I Google'd it, just like anyone of us would. lol

Here's what I stumbled upon... It's a fantastic analysis of all the different types of oils, multiple tests, and an overall statistical review of which oil they found to be the best overall.

Lucky for us, the oils they did the tests on are the same types of oils that we all use...10W-40! If you don't feel like reading through the whole write-up, feel free to scroll all the way down to the end where the final results are.

Needless to say, the vendors know what they're talking about ;)

I hope everyone can take something away from this in deciding which oil to buy for their bikes.

Enjoy!

http://www.combscustoms.com/pdfs/Amsoil_Study.pdf
 

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I stick with the Kawasaki 10W40 and OEM filters. Got a five-year warranty so want to keep it "worry-free". It's JASO MA and all that.
 

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Im an Amsoil Dealer and it is good oil. The important thing to remember when buying motorcycle oil is that it is rated to meet "JASO MA" spec. This means it is wet-clutch compatible.

So you want to know what the "best" oil is? That depends what you want it to do best. For racing, in my opinion, the Maxima 4 Extra is best, due to the having the highest levels of zinc and phosphorus. For longevity, Amsoil has the highest TBN rating, which means you can run it for a long time between changes. Best oil for the price is Honda GN4. Whats best for you?

Oil is oil, until the additives are blended.
 

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Keep in mind, that study is almost a decade old. I've tried pretty much everything and the Mobil 1 4T is the best I've tried from a feel standpoint. No other oil had made such a significant difference in the shifting smoothness as much.

But hey, Scout runs amsoil so it must be good stuff.:ayyy:
 

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Im with skydork, ive tried most of the primo stuff and in terms of shifting feel Mobil One Racing feels great and lasts. Motul 300v feels even better but fades on me at 1500 miles or so.

Will be using Redline for the first time next round so im looking forward to it.
 

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That study was paid for by Amsoil. I'm not saying Amsoil is automatically "bad" because of that (it's not), just be aware that the various tests may have been cherry-picked to showcase their own product's strengths, and may or may not have anything whatsoever to do with how long your engine will last.

I've used Rotella for a long time, but recent reformulations to address diesel particulate filter compatibility have me skeptical, and I've switched to Motul 7100 (which did not exist when this test was done).

I am not surprised at the Lucas and Royal Purple results. Those are two brands that I won't use. Castrol is not one of my favorites, either.

FWIW my car was a mild oil-burner when I bought it (used car dealer had probably used the cheapest possible 5w30 that they use in everything) but has near zero oil consumption 80,000 km later when I use the specified Mobil 1 0w40 ...
 

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Discussion Starter #8
Thanks for all the info. guys. I saw that this article was done a little while ago and also that it was done by Amsoil. I just figured the quality of the oil can only get better as these companies make enhancements through the years, and that the tests would should show some validity and not totally be biased towards Amsoil. lol I've always used the Mobil 1. I've just gotten feedback from multiple people that Amsoil is the way to go. So, why not?
 

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That study was paid for by Amsoil. I'm not saying Amsoil is automatically "bad" because of that (it's not), just be aware that the various tests may have been cherry-picked to showcase their own product's strengths, and may or may not have anything whatsoever to do with how long your engine will last.
Agreed. No surprise that Amsoil came out on top when they were the ones doing the testing.
 

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Just got some redline to try out..
Haven't started my bike in a while..
Not going to until I finally get to change my oil.
Seems like a waste if I did it now and let the bike sit until it gets warmer out..
 

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Do a search a bunch of oil studies done outside amsoil and ams syn tests out on top despite testers' bias.

Also, ALL oil since the diesel oil went into stellar mode a few year back as reached very good quality levels. Don't forget amsoil filter for our bike. That is very good, too.

I'm still around 7,000 miles on my amsoil right now. One thing after the other stopping the loop, but the weather is good here right now.
 

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Don't forget amsoil filter for our bike. That is very good, too.
The EA filters catch particles down to 2 microns and are specially designed for a long service interval. When doing extended drain intervals, you need to use the Amsoil filter. The next best choice is the OEM filter.
 
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