Changing your engine oil three weeks maximum one month, use a good recommended engineer oil, don't buy a Road said oil it will damage the piston and Rings of your Generator.

2) don't over load your Generator if you are using a 2.5kva generator maximum load you should apply should be 2kva like wise the big models

I have been using my FIRMAN Generator SPG3000E2 since May 2019 I have not had any issues with it just because I changed the engine oil at the right time and I don't over load the generator, some people say it's depends on usege I don't think it is true please like and share let protect our Generators