The The Mobil 1 has 30 hours on it at this point. I removed some to inspect it. It is not coal black but is dark brown/black when observed closely outside of the reservoir, definitely a lot darker than fresh out of the bottle. What do you guys think of removing the filter, adding Exmark Hydro Oil, and putting the same filter back on. I would run it for a few hours, drain again, install a new Exmark filter and refill with more Exmark Hydro Oil. I have always felt oil anylisis is too expensive. It is cheaper to change the oil more frequently.
Ford F350 & Ranger
Exmark Lazer AS 60" 28hp Kawasaki
John Deere GS30
John Deere 14PZ
Honda HRC 216
Shindaiwa T270, M231 Muliti-Tool & EB802 Stihl MS230 CBE