NOT KNOWN FACTS ABOUT TYPES OF HYDRAULIC FLUID FOR BOBCAT 753

I operate 15W40 in my engine, i run 20W50 in my hydraulics due to the fact i obtained a good deal on it. Now the following deal rolled all over for 15W40 (a little bit around two bucks a litre), next oil alter, is't currently being adjusted to thatI don't Believe it would truly hurt anything at all in the Bobcat, but "tractor" hydraulic fluid commo