- Reaction score
I am also a believer in oil analysis however most of the ones I have used are detailed enough to distinguish between saltwater or coolant intrusion. The company I use most often is Blackstone Labs. After checking all of the basics on your engine I would look at sending your oil somewhere else for a more detailed analysis. I do agree that it is almost certainly coolant though. If it were saltwater you would see mostly sodium but not much potassium. How are your phosphorus and boron numbers? These are also indicators of coolant leaks. There are a couple other elements too but I can't remember them off the top of my head.