"Mark" wrote in message
...
Have just bought my first one.

I have to put 2% oil in with the petrol.

Is it okay or even normal premix, say, a 5 litre container full?

How long would it store for made up?

The instructions that came with my petrol mower say not to keep petrol more
than 30 days unless you add a petrol conditioner which allows you to keep it
for 90 days. I've kept petrol for upto 9 months in a sealed container with
out bothering with conditioners. Still seems to work fine after that.