Well fair enough, but as i have stated before, but maybe not on this thread, im air cooled certified, not liquid cooled. I do basic service on liquid cooled, and i have installed them in the past, but i dont do detailed service work on them. Main reason...it costs me enough $$$ to keep up the air cooled certification and parts storage. I did not feel the money it would cost to obtain liquid and diesel certification would be worth it. I have multiple $1,000 of parts in stock to service air cooled, and an entire stocked service truck than i use to repair and service the air cooled units. When i call into Generac tech services, believe me when i tell you i get a totally different level of tech support than a Non certified tech would Receive. There usually spot on in assisting me with repair. I also have never had Generac refuse a warranty repair in all the years i have been with them. They have backed their product to the point of sending me a new engine to replace one that was losing oil and i could not find source. They paid for engine and my time to swap it out. I have been able to locate parts for 25 year old generators thru their parts department.