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An IDI will not smoke burning 4 quarts in 100 miles. For reference I run up to and sometimes past 50% waste motor oil in mine, I get average 14mpg of mostly city driving. That's about 3.5 gallons (16 quarts) in 100 miles with no smoke other than typical diesel under heavy load or acceleration.
A compression check is a good test but it is possible that the compression rings are good while the oil rings are bad, I've had it happen on a gasser.
If an injector was bad you'd have a misfire, if it was washing down the walls the oil level would rise. Besides you're running waste oil so even if it was washing down the walls it would be lubricating them.
As for starting hard at 60F, how thick is your blend? Does it start hard both warm and cold? One more than the other?
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1986 F350 Crew Cab 2wd SRW. 1991 7.3 IDI, T-19 4spd Sterling 10.25 3.55, 12" HD clutch. A Banks waste gated turbo. 5" cut down Peterbilt stack. Midwest rebuilt IP turned up. AC Delco 6.5 GM 12V GP's, working great. Running W85 high performance zero-gel diesel! D60 front conversion, 4wd conversion, dually conversion, and steel flatbed conversion now underway. Man those frame rivets are a pain!
1966 Porsche 911. 1983 911 SC engine with modified Zenith carbs, headers, 911S brakes, custom fuel rails, MSD 6al box with timing computer, 1974 IROC body kit. 1850lbs, 200rwhp, total blast to drive.
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