How long does pre-mix last?

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DirtDaddy
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How long does pre-mix last?

Post by DirtDaddy »

Just read something in the owners manual about pre-mix that I hadn't heard before. To quote, "The lubricative quality of this mixture deteriorates rapidly; use a fresh mixture for each day of operation." So how long after mixing is it OK to use? Can any chemists or oil experts educate me a bit as to what happens to the oil? BTW, I will be using AMSOIL Interceptor @ 40:1. Thanks.
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Post by Mr. Wibbens »

I've run Mobil 1 mx2t up to a year an a half old and had no problems at all
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Post by radonc73 »

When in doubt put it in your car and buy new.
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Post by cyclenutz »

I have a boat with twin 200 Merc outboards that i premix (100 gallons "not fun") Some of it sits all winter 6 months, never had a problem. Or with any of my other premix motors over the years.
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Post by skipro3 »

A modern oil, especially synth of great quality, will last indefinantly. The gas, however, will get old and loose it's octane a bit. I would not recommend using past 6 months.

I'm not a chemist, but I play one on KDXRider.net
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Post by GS »

I wouldn't dump old pre-mix in my car......not with a Catalytic converter? Am I missing something here?

If it's 6-8 months old, I use it, but PREFER to toss in some fresh stuff at the same time.

Never had any problem with PRE-mix old gas, as opposed to straight old gas....which has given me lots of trouble here and there.
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Post by fuzzy »

I run it in the John Deere. As mentioned pump-gas/synthetic for the bike I'll run in the bike months later. I run race gas in my karts with castor oil, and that stuff doesn't last for diddle.....At least to make be feel comfortable running it in a 16k RPM exotic 100cc engine....Not to mention giving up a bit of HP due to octane loss isn't an option here.
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Post by midlifemoto »

use a gas stabilizer
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Post by Mr. Wibbens »

re: use a gas stabilizer

Don't need to (IMHO)

I think the oil does the same thing

I premix all my gas in cans at the house, to save confusion about whats mixed and what isn't. So I run premix in my lawnmower. My lawnmower sits all winter with the same ol gas in it and every spring it starts right up and runs fine. I've had it for eight years and still running the original plug. Been running premix in it for 6 years

When my KDX sat for a year and a half, it started in about 12 kicks and ran just as good as it always did
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Post by DirtDaddy »

Thanks for all of your input. It sounds like this really isn't a big issue. I'm hoping the KDX won't ever be idle for more than a month without being ridden anyway! Just curious why Kawi would state that in the manual. FYI, I received a reply from an AMSOIL tech rep on this subject, and he said that the oil would not be a problem, but that he wouldn't recommend the gas sitting around for more than a month. He did not elaborate on why.
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Post by alistair »

>|<>QBB<
DirtDaddy wrote: Just curious why Kawi would state that in the manual..
im just guessing here,but as the kdx hasnt been changed since 95,the manual probaly hasnt..but the oil technology has improved. OR its just covering their own :butthead:
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