Motorcraft Filter run on Cub Cadet 22hp Kohler. Atrocious

I would first pull off the flywheel cover and make sure that area under the blower cover and fins are free of debris and any greasy buildup.
The OP said he’s running it without the shroud and tin covers. 👇

“I've been down that road, doesn't seem to make much difference. I have the whole grill and fascia out to keep more air on it. Need to pull the engine out to replace the rear main and it's low on my priority list, no oil leaks until the engine has been running for 30-40 minutes, by then, almost done cutting. As I understand it this engine is already past it's normal life expectancy. I bought an identical cub mower for $400 with 250 hours on it, I gave it to my little brother.”
 
The OP said he’s running it without the shroud and tin covers. 👇

“I've been down that road, doesn't seem to make much difference. I have the whole grill and fascia out to keep more air on it. Need to pull the engine out to replace the rear main and it's low on my priority list, no oil leaks until the engine has been running for 30-40 minutes, by then, almost done cutting. As I understand it this engine is already past it's normal life expectancy. I bought an identical cub mower for $400 with 250 hours on it, I gave it to my little brother.”
Missed that. He needs to put them back on. They are there for more than cosmetic reasons.
 
Looks like the ADBV is digging into the base plate inlet holes pretty good, which actually blocks the inlet holes flow area. Could cause some flow reduction depending on the pressure relief setting of the oil pump. What Motorcraft filter model was this?

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