Linseed oil for wood wagon decks?

Looking for a source of several gallons of linseed oil to treat wood wagon decks that must be stored outside over the winter. Wondering if there is a source that is cheaper than local hardware store, especially in larger quantities than gallon cans. Any other treatment that is better/cheaper? Wood is fresh oak (deck built this spring), treated pine, miscellaneous other woods - 4 separate wagons.

Could you use some old engine oil? I know it wouldnt make them look as nice as linseed, but chances are you already have some of it sitting around, and it should work to keep the moisture out of the wood, right?

Don't have much used oil, what I have is off a diesel - rather nasty to deal with, stains your hands, clothes!

Used motor oil.

I also have a trailer with a wood deck that has to sit outside all year. When I replaced the deck with pressure treated fir 2x8 boards, I used boiled linseed oil that I bought at our local farm store. It took 2 gallons, but it has done very well for 4 years. Next summer I plan to put another gallon on the deck.

I really put a lot on the boards and they soaked it up very well, especially the first coat. The boiled linseed oil has a chemical change in the air and becomes much harder after it has cured for a few days. I did my trailer deck in the hottest part of the summer though.

Another thing I do is to jack the tongue of the trailer up as high as it will go, with the jack on a large block while it is parked. That way the rain/snow moisture will run off the low end of the trailer. I don't know if it really helps much, but the idea seemed good to me.

The linseed oil was fairly expensive wherever I looked, but it seemed to me that the farm store price was the lowest, although not by a whole lot. I would worry a little bit about how well the linseed oil would cure this time of year around here, but hopefully your weather is warmer. We expect lows in the teens this weekend, maybe a new record low. Good luck!

I cringe every time I hear someone is going to use linseed oil! Its great stuff BUT don't wad up a rag that has been soaked in it and throw it in the trash. It will catch fire and burn your building to the ground. I've seen it many times and a fellow down the road did just that several years ago after refinishing some old furniture. He was building a new house at the time and all his furniture was in the shop. He lost it all AND some collector cars as well.

Cut the first coat with approx 50% turpentine, soaks in better. Regardless best to do it on
the hottest summer day. If remaining outside over winter with a snow cover, I would finally spray a final sealer coat such as Thompsons to repeal the water. Thompsons isn't very good by itself. Intially a lot of work but it will save your deck. I spray the Thompsons with a hand sprayer dedicated to the job which only takes a few minutes. No doubt used oil is cheap and works good but I refuse to be continually exposed to the stuff either on a wagon or trailer. To me it is worth an extra $50 on a new $100+ deck to have something that doesn't smell and look nasty. Perhaps one less night out at a good steak house.

Raw linseed oil, pure turpentine and a drying agent.Gives a natural look.
Did the internal woodwork of my first house with that.Great job if I may say so. Brush it on.Quick, no brush marks.

If you are going to store wood wagon outside make sure that the bed doesn't have anything on it. Like leaves, hay, dirt or any thing that will hold water and rot bed. My Brother-n-law used my small utility trailer for 4 years and left somthing in it when I got it back it cost me $150 to put new deck on it. Deck was treated pine.