Paperwork is the enemy of many, but when it comes to the slip we put in every free test kit, that's not the enemy; it's your best friend.On the slip we don't just ask about the engine or oil you're sampling -- we want to know if there are any issues you're either aware of, or have reason to suspect. Reason being, there is a big difference between saying "You have a problem that you should fix soon" and "Hey, here is the coolant you're already aware of -- here is how the engine is doing in spite of that," or "here are other issues that warrant your attention." Blackstone Joe illustrates the importance of filling out a slip with a recent story from a 6.0L PSD.Bonus point: What testing do I need if I'm worried about a coolant leak?

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