But warm compression doesn't help on a cold start. Cold compression is what counts on a cold start. And I would argue, it is a better indicator of good compression. Good cold compression will translate into great warm compression. When one of us goes to look at a car we might buy, we usually want to start the car cold, and are disappointed when the engine is warm. Just about any warm diesel will start. But a cold diesel is much harder to start. I've experienced it myself. Having a hard time getting the old girl started on those cold mornings, but once she's been run she'll fire up quite easily.

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