I have a 60 inch Exmark Zero Turn Mower with a Kohler ECV 980 EFI Air Cooled V-Twin. (999cc, 38 HP, 2.1 quart service fill with filter). I plan to change oil each 50 hours or 1 year which ever comes first. Kohler manual recommend 100 hour OCI with SN rated oils of the following SAE viscosities based on the outside air temperatures the unit is being operated in
above 32 F - 20W-50
above 0 F - 10W-30
above 50 F - 30 W
Below 32 F - 5W-30
My operating temperature range is from 25F to 100F with most time spent operating from 35 to 85 F.
I plan to use HDEO with API CK-4 (no dual rated oils with SN rating) with my first choice being 15W-40 with possible 5W-40 being considered to reduce battery /starter load and to get oil flowing quicker during the colder times. I believe the engine has hydraulic lifters. The mower is usually used one time per week from April thru November. I expect around 40 hours per year use.
Interested in your thoughts on the best oil choice for my equipment and use.
Leaning toward 15W-40 CK-4 Rotella T5 or Mobil Delvac
Thanks
Slick
above 32 F - 20W-50
above 0 F - 10W-30
above 50 F - 30 W
Below 32 F - 5W-30
My operating temperature range is from 25F to 100F with most time spent operating from 35 to 85 F.
I plan to use HDEO with API CK-4 (no dual rated oils with SN rating) with my first choice being 15W-40 with possible 5W-40 being considered to reduce battery /starter load and to get oil flowing quicker during the colder times. I believe the engine has hydraulic lifters. The mower is usually used one time per week from April thru November. I expect around 40 hours per year use.
Interested in your thoughts on the best oil choice for my equipment and use.
Leaning toward 15W-40 CK-4 Rotella T5 or Mobil Delvac
Thanks
Slick