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Is there a service to test antifreeze? I'm thinking something like there is for oil where you send in a sample and they tell you what's in it (contaminants). I have a liquid cooled generator. The coolant has some form of goop (highly technical term) in it. I've flushed the coolant and it's...

I have a generator that is liquid cooled and is run by a small 4 cylinder engine. It runs off of natural gas. I'm looking to change the oil and the recommended oil is 15W40. I'd like to switch over to a synthetic oil. Any 15W40 I find is labeled as being for a diesel engine. Not sure what forum...