I understand Exmark's engine rpm's are set at 3750 from the factory. Does the Kohler 28 efi consume oil on your Exmark at this rpm setting? The Kohler engineers say 3750 is their recommended high end setting and this will cause no problem with the engine. My 28 efi did not use oil but when I stepped the rpm's up from 3600 to 3750 there was a very noticeable difference in oil consumption immediately so I dropped back. I really like the 3750 it does better all the way around by holding the rpm's up but I don't know where the oil is going so fast. Any thoughts on this problem?