The difference between marine plywood and exterior grade plywood is the quality of the veneers. Marine ply cannot have any voids. The glues are the same.
When sealing any wood, and particularly plywood, the most important thing is to seal the end grain. That's where the majority of the water comes in, and moisture coming into the end grain brings rot spores with it. Anything that will seal up the end grain will help preserve the wood.
The best material you can use to seal plywood is an epoxy sealer such as WEST system. But epoxy is not cheap. My next choice would be a good enamel paint, with several coats on the end grain. The one thing I would never use is polyurethane varnish: it does not hold up in exterior use, spar varnish is better in this respect.
Why anyone would treat wood with used motor oil is just beyond me. I guess there are folks out there who are even bigger cheapskates than me.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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