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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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