You probably need to have the oil pump checked to make sure the relief valve isn't stuck as been mentioned. That happened on one of my supervisor's car. He had zero pressure and the lifters started to get noisy. He had a stuck relief valve. He called me at work to tell me what he found and for me to pick up another pump. I went over to help him to install the pump. Sludge is what caused his relief to stick.
You could change to straight wt 30 oil to see if that helps. You have a heater to help preheat the engine. I had the oil pressure to drop on a Farmall A that had a complete engine rebuild. I was using 10-30 oil since I rebuilt the engine during the winter. I was plowing the garden and I noticed the pressure dropping. I pulled out of the garden and drained the oil and installed 30 wt oil. Went back to plowing and had no more problems with oil pressure. I also use 30 wt in my garden tractor. It it get's down to zero I use a dipstick heater to heat the oil. I've had this tractor 41 years. Hal
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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