Last few mornings it has been in the 20'sF and a few days ago if I did not have my twin Group 31 batteries (Not sure what that is equal to battery size in the EU) I don't think my diesel would have finally started. Most of the time it starts up at half a rev so I wanted to know what is to be expected in cold temps. What is normal? Last year I was chasing an air leak and ended up replacing my fuel filter housing which worked like a charm. But by the time I fixed it, it was starting to warm up so I thought the problem was fixed. I might be chasing another air leak, but I wanted to see what I should be expecting from a properly working engine when it is really cold.