Amsoil does hold up to extended drain intervals much better than standard synthetic oils. It will certainly have the utmost protection throughout the standard drain interval a lot better than the kaw dino oil would. In any case, I wouldn't try to stretch the interval out that far, oil is cheap, engines are expensive. I've been changing mine every 500, but am going to analyze the oil after the next 500, and see if I should be waiting for 1000 miles. The oil I drained today had 510 miles on it, and it wasn't even black, totally clean and transparent still.

 

What do you mean? Standard synthetic oils? Or are you prefering to Sythenic-blends?
Amsoil is no-more better than any other 100% Synthetic motorcycle engine oil, as long as the 100% synthetic oil meets the API required Grades for your engine.
I have been using Bel-Ray in all of my ATV's with excellent results & I have increased my oil changes to every 800 miles, instead of every 400 miles with standard motor oil.
As far as oil-filters go, I have switched over to the Scotts Preformance reusable steeless steel micronic filter cloth & so far I am 100% impressed with it but I don't think too many atv'ers are willing to spend $100 for a Prairie 650 oil-filter, even if it is reusable after servicing & cleaning the filter!

 

Purolater Pure One o/filter(fits most Mazda rotary and 1.6 piston engines)--- Castrol Syntec 10/40 . Sorry, I can't remember the #. CRS..................................

 

Bfb, in reference to some above comments regarding amsoil going for longer than normal drain intervals, and my standard synthetic oils comments ... - Amsoil and a few others are specifically formulated to be EXTENDED DRAIN INTERVAL synthetics, as compared to a standard mobil 1 synthetic etc. Their additve packages hold up over a longer period of time, are more expensive, and are generally made up of exclusively group 4 basestocks/esters, instead of a group 3 and 4 blend. Whether amsoil's motorcycle oil is forumlated to be an extended drain oil, I'm not sure as I've not seen its makeup and oil analysis results with it. They do claim double your recommended interval with the oil I'm using, and I'd bet its got a very robust additive package. I'll know more after the next analysis. I have no doubt the stuff can probably safely do 1000-2000 miles with acceptable wear metals, but I'll slowly increase the interval with analysis testing.

Making a blanket statement that 'amsoil is no better than any other 100% synthetic" is just ignorant, no offense... Also the term 100% synthetic has been widely up for debate, since the syntec lawsuit.. One would do better if they could find out the type of base stocks used.[img]i/expressions/face-icon-small-smile.gif[/img]

 

sure just like eating up the AMSOIL claims is. What kind of a 100% synthetic oil is AMSOIL - is it an esther based synthetic like MOTUL is or does it have mineral base oils? enlighten us on this extended drain synthetic, please.

 

Nobody is buying into any claims, I said I would verify by oil analysis, and I said that I wasn't sure if the atv oil was an extended drain formulation. In diesel oils, extended drain interval oils like mobil delvac 1 and amsoil diesel oils can safely go a lot farther between changes than a standard oil like a mobil 1.

 

This is due to the additive packages on the diesel oils. The whole formulation is different, phosphorous, zinc etc levels are different for a different application. What you said earlier was:

"Amsoil and a few others are specifically formulated to be EXTENDED DRAIN INTERVAL synthetics, as compared to a standard mobil 1 synthetic ". Amsoil is not specifically formulated to be extended drain synthetic any more than Mobil1 is.

Lets compare apples to apples if we are comparing oils.

 

Say what?
You better read the Amsoil page again as it also states 100% synthetic oil is what there are offering.
When it came down to testing the 100% oils vs the blends, the result of the blends was just a bit better than the standard motor oil but not by much.
This test was done on high-rpm motorcycle engines & all of the claimed 100% oils preformed as claimed, with no clear winner, including Amsoil. As far as extended oil changes, this is a claimed by most who offer 100%.
You the rider, should take it upon yourself & change your oil at either the factory recommended miles or longer if you feel the fully synthetic oil is doing its job.
I go 800 miles now on oil changes & the drained oil looks like I just poured it into the engine, no loss of color at all. This oil test also had analysis included & this is the test that caught my attention & ever since then I have switched over to the 100% oils.
The main reason I use the 100% oils is the cooler oil temps, no foaming, its very slippery & it can handle the harsher riding conditions that I consently ride at. Just don't switch over to the synthetic oils too soon, be sure your engine is broken in.
It doesn't hurt to spend the extra $$$ on a excellent oil filter either, that is why I use the Scotts performance oil filter.

 

You are missing my point bfb. Yes amsoil is 100% synthetic. However recently oils like castrol syntec have claimed that they are 'synthetic' while having a portion of their makeup non synthetic. They squeaked by and won their lawsuit, barely able to call themselves a 'synthetic oil'. Amsoil and mobil 1 are full synthetics. You say you had analysis done with your last change. Lets see the oil analysis results....?

Tundraotto, I think your argument is one of semantics. Maybe I chose the world formulated incorrectly assuming people wouldn't read too far into my words and just accept them. Basically what i'm saying is that a few of the specific extended drain interval oils, like amsoil, have a much more robust additive package, that provides for an extended drain intervall. If you dont believe me just compare the oil analysis results from a diesel going 10K miles on Delvac 1 or Amsoil compared to standard diesel oil like Rotella T..... The additive package and tbn depletion on the premium synthetics happens at a much much slower rate, as well as a slightly stronger film strength on the synthetics, offering better protection all the time. In gas engines, a basic synthetic like castrol syntec will break down and be worthless a lot sooner than an amsoil synthetic or a redline perhaps, something designed for extended intervals. These are known facts..

 

Yes, see now you are on the same page with what is true - amsoil and mobil 1 are BOTH fully synthetic oils (even thought neither one is esther based) and have DUE TO THE NATURE of synthetic oil - extended drain intervals. However the longer I read into your post you start talking about comparing diesel oils like Shell Rotella T to Mobil 1 etc... AGAIN!!!???? Apples to apples remember?

I understand the advantages of the synthetics, what I dont understand and agree with is your AMSOIL "formulated for extended oil changes" crap, all synthetics are formulated for that by their nature, not AMSOIL exclusively.

PS. most people can understand the difference between a semi-synthetic ("synthetic blend") and fully synthetic.