Top off with a heavier oil for 0w-20?

[proffittmarke]

As others have said, Blackstone's fuel dilution value should be taken with a grain of salt. It's wrong more often than it's right. This is because they're essentially guessing, not actually measuring it. You'd have better luck hitting a 300m target with a blunderbuss. I've seen too many cases of Blackstone reporting "trace" or no fuel dilution where GC found 4% or more.

Who would you recommend for doing my next oil analysis? I am not familiar with acronyms GC. I’m open.