wrote in message
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I just realized they don't use a radiator and only circulate the
water. If the block is drained, why add antifreeze?

Most people simply drain the block and do not add antifreeze. All the
blocks have a drain plug at the lowest point in them. There is also
typically drain plugs on the exhaust manifolds or you disconnect the hoses
going into the bottoms of the exhaust manifolds. Often you disconnect the
hose coming in from the outside as well. On a Mercrusier this often will be
going to a water exchange power steering fluid cooler. The out drive should
be lowered for storage and it will drain it's self in this position.

Unless you have one of the more sophisticated closed cooling systems there
is not any antifreeze anywhere. "Raw water" cools everything and then is
pumped back out with the exhaust. There are closed systems that have a
water exchange radiator instead of an air exchange one. It will look like a
big tank somewhere on the front of the engine. They still need the raw
water sections drained but it's not likely your friend has one of these.

The oil is usually pumped out the dipstick tube. There are electric pumps
and cheaper hand pumps. It is way easier to get the oil if you run the
engine and get the oil hot first. Don't run it on land without the rubber
garden hose muffs hooked to the outdrive and the water turned on. Or if it
has a raw water pickup on the bottom there is other solutions for hooking a
garden hose to it. The raw water supply pump is rubber vaned and the rubber
will melt in short order if it is run dry.