Hmm consider switching to a lighter oil. I have Rotella 5w40 in my car after recommendations from this forum. I don't want to even consider what starting on 15w40 would be like in the teens or single digits !

I know it's been mentioned, but don't downplay the importance of cycling your glow plugs multiple times! I had to start one night in the single digits and it does help a lot!

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-Typos courtesy of my mobile phone.