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Q: Diesel is having trouble starting in 40 degree weather when plugged in. on 1999 Ford F-250 Super Duty

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Occurs when it's been shut off for more than five hours during the day while at work. Batteries and alternator are fine.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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This info is from Repairpals Common problem reports for your vehicle
RepairPal Verified "Use correct oil to prevent engine performance problems"

Using the correct oil for this engine is critical. Improper engine oil can foam in the high pressure system and not develop enough pressure
for operation. Symptoms of this can be hard starting, long cranking
time before start, rough engine idle, and a lack of power. Another sign
is tiny bubbles in the oil on the engine oil dipstick after the engine
is shut off. The additives in the correct oil that protect against
foaming can still break down, so changing the oil at the correct
intervals is important.
try replacing the glow plugs see if that will help. if you dont want to do all of them, remove them one at a time and check their resistance.
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