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The fluid in the big hose and coming out the nipple appeared to be antifreeze. Having removed the thermostat and putting an additional half gallon in appears to have taken care of the thermostat area. Hopefully, things should be OK after having drained the block, run it while feeding AF, and...

Thanks again for the advice. I pulled the thermostat. The housing and the hoses leading to it were empty. I added some AF to the space and the hoses. It took about 1/2 gallon. Hopefully, that will take of things. It's a good thought on the sand and debris. The boat stays docked and doesn't...

I put muffs on it and ran the engine on a garden hose until the temperature stabilized. I turned the engine off, and drained the block with the "single point" valve. Then, I put the muffs on a 5 gal winterization tank filled with the antifreeze, put the muffs on the intake, and started the...

Thanks for your response. This is a 2016 engine with the "single point" system. I let the water out through the large drain valve at the front of the engine and opened the blue drain plugs. Hopefully, it will work as advertised in draining the block.

I just finished winterizing my 4.3L mercruiser with -60 Pure Oceans marine antifreeze from West Marine. My Searay is in upstate NY in the Adirondacks where temps get to -40 a couple of times a winter for a few hours at a time. After re-reading some info about antifreeze and burst temperatures...

Great, thanks! I didn't know if it was more critical with a new marine engine. New boats are too expensive to make a mistake.

I purchased a 2017 Sea Ray 19SPX I/O with a 4.3L Mercruiser this year. I'm preparing to winterize it and I'm trying to find out if the engine came with synthetic oil or regular oil. The literature that came from with the boat indicates what type of synthetic oil to use if you're using synthetic...