Its been a while since this has been beaten to death, so i'll bring it up again, things may have changed since the big threads on this 3 years ago. I have an '07 ZAS, and a '10 Z, and a TTXP. Im changing the hydro oil/filters on them, I noticed the NLZ has dual filters that look like they go into a canister or something, the other ones look like regular oil filters. I thought they were supposed to be 10 micron filters, but the invoice has them listed as 25 micron. The filters were $24 ea, which is stupid money for a filter. Anyone have an alternative filter? Pure One I believe are 20 micron. Then the oil. The Exmark Hydro oil is $10.99/qt. again, stupid money for hydraulic oil. Mobil 1 15w50 is around $4.85/qt, and from what I read, the 15w50 formula has been untouched. Just trying to find a way to not spend $50 to change a filter and 2 qts of oil.