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Most likely changeing the rear main seal wont cure your oil leak, most likely your engine is hi-milage and its getting blow by from rings and valves......
You have a cold weather leak, are your hoses new,clamps new > and 7lb cap is fine for all weather unless your in a desert inviroment. Thats all i,ve run on everything i own for 40 yrs. Big equip is well known for cold leaks. Silicone hoses works the best for solveing this but on a 715 theres none