I would have preferred that the heaters and oil be sold seperatly. My dilemma is that my location in Michigan can reach 100° in summer and -10° in winter. 10-W-30 is a more suitable oil for my application than the synthetic provided in the kit.
I'll be da**ed if I'll change the oil from season to season.
We suggestion following the specifications in your Owner's Manual to keep your warranty intact & get the best performance from your generator.