Winter Cold starting issues are 98%:
#1. Bad glow plugs
#2. Valves not adjusted
#3. Weak battery and/or starter
#4. Bad/Poor ground from body to engine
#5. Engine oil to thick for the ambient temperature/climate.
Winter Cold starting issues that are 2%:
* Plugged filters
* Diesel jelled = summer fuel, contaminated fuel and/or extreme cold ambient temperature.
* Bad o-rings and/or hoses leaking air in the fuel system when cold.
Glow plugs link thread
All diesel models
http://www.peachparts.com/shopforum/diesel-discussion/137732-glow-plugs-link-thread.html#post1019018
Starter health is important to your diesel!!!
http://www.peachparts.com/shopforum/diesel-discussion/107318-starter-health-important-your-diesel.html#post739798
Cold weather starting links
http://www.peachparts.com/shopforum/diesel-discussion/137674-cold-weather-starting-links.html#post1018529
.
__________________
ASE Master Mechanic
https://whunter.carrd.co/
Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer
1985 300SD
1983 300D
2003 Volvo V70
https://www.boldegoist.com/