Just a little thinking out loud on the issue of (use our oil or NO warranty issue) if you mix oil to the same ratio as recomended, & the oil you use has the same colour dye, ie. Blue Red, whatever,& has equiv rating to their product, saw coughs, dealer says what oil are you using, yours lie I through my back teeth, my thought is, is he going to send for analisis( big expense ) or just look at the fuel colour, repair saw & submit claim to saw manufacturer. Do they then try to prove that you used THEIR oil or just meet the claim to the dealer. A for example use Stihl oil or else, Stihl oil does not carry the highest Jasco rating, the oil you use does, my thoughts are, how can they blame a higher rated product for a failure & not meet the claim, but if you use their lesser rated poduct & it fails they will honour the claim, seems like a lot of insider wheeling & dealing to me, it seems if the oil is to an equal or better rating & mixed to correct ratio, the claim should be met with out a load of hassle ( not sure if we have the law mentioned in an earlierpost here) As an aside are you also in breach of warranty if you use 32/1 instead of the 50/1 mix. Gets to be somewhat stupid, but in this day & age of whatever you do; BLAME some one else for every problem, & try to claim, or get out of paying, even if all the fingers point at you, I sometimes despair