My diesel has been starting weird in cold weather. When it sounds like it is starting I have to hold it in start for several more seconds until the RPM builds more. If I cut off the starter too soon I get nothing. There was a video posted here a few days ago and that gave me the idea on how long to hold the starter on.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.