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When my new engine goes in, its going back to glow plugs hooked to the same switch. Like said above, glowplugs are best overall, and will work better in extreme cold temps than ether will. For instance, when it gets in the negative teens, i have to take my ether can in the house to warm it up before i can get things started. Also, as Tom mentioned, ive been outta ether in the middle of nowhere... not fun, luckily a big rig stopped that happened to have some.
I would repair the glow plugs unless you have a reason not to, current money situation, or physical problem like stuck plugs, or buried controller as it is with mine. Even if you cant get 1 or 2 plugs out, it will still start easily enough on 6 or 7
I suppose I can give it a go. I'll probably wait until summer when I have a bit more time and money though. Just in case.