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Message: <blockquote data-quote="Fishfiles" data-source="post: 19072" data-attributes="member: 782"><p>My choices are : Hydraulic oil in the tank and 15-40 Shell Rotella in the engine is my favorite , I have never been able to find 10 w 30 Rotella so 15-40 is the substitute , I am in the south where it really doesn't get too cold , motor oil in the hydraulic tank is no longer recomended by Bobcat as I have read in thier service bulletin that new motor oils have additives that are not compatable with hydraulic seals and components , and I have always found it is too thick and causes hydraulic code and warnings as motor oil is too thick , as far as synthetics in the hydraulic tank I feel it's a waste as leaks will occur , one blown hose can cost you all the oil in the tank and it is too expensive to waste like that , I see very few pumps go out and have been putting hydraulic oil in the tanks for the last 25 years , long before it was ok'ed by Bobcat , I was a service manager of an rental house that had 90% Bobcats products ,we had over 50 Bobcats in the fleet at all times , back in the day I was told we had more Bobcats than any rental house between Houston and Atlanta and never used motor oil in the hydraulic tanks , motor oil in the tank is a myth that will only cost you more money , as far as the chain case the cheapest motor oil 10-30 --------thats what I believe --------fishfiles</p></blockquote><p></p>