Antifreeze quantity for winterization

[marks737]

Hello. Have QSB 5.9 engines. Is 7 gals of antifreeze enough to run through each engine for winterization?

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[Rob Schepis]

Should be fine. I run 6 gallons through my 6BTA’s. I first pull the zincs to drain the coolers to minimize dilution. I catch what drains out the transom exhaust outlets and check with a refractometer and it’s always a match to what’s in the jug.

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marks737

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