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C5, next time you do an oil change, try sending a sample to Blackstone Labs for an analysis. Contact them first and they send you instructions and a sample bottle you mail in to them. Costs like $25 and it tells you all sorts of stuff. They also analyze if there's water or antifreeze in it. If you drain it hot, as we should, there shouldn't be any appreciable water in there.
Thank you for your service.
John B.
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