On Sun, 07 Jun 2009 10:10:53 +0100, Ted wrote:

The instructions with my new Ryobi strimmer tell me not to mix more
petrol/oil that I can use within 30 days...Anyone tell my why this is
and if it really matters to a couple of months..

Ryobi are American, I think thier "gas" must be different to our petrol as
you quite often see that warning and you can buy "gas conditioners" to
prevent it.

I can't say I've ever had a problem with oil/fuel mix after being in the
fuel tank (thus not 100% sealed) of my Ryobi strimmer. Even over winter.
Make sure it's well mixed in the first place and slosh the old stuff about
in the tank in case it has settled (but I don't think it would).

--
Cheers
Dave.