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My 06 v10 does not have a block heater in as it came from oklahoma, and I am going to put one in before winter. I talked to couple of shops and some say you can put 2 block heaters in, one in each cylinder bank. One shop even recommended this because it is " such a large motor". Anyone ever heard of or done this before?
Yes, it can be done.
But I'm not sure it really needs to be done. The engine is not really all that big. Dimensionally, it is closer to a small block Chevy (but longer) than an old big block or a diesel.
If you plan to leave plugged in all night, one should be fine. If you will put on timer, two heaters would heat up faster.
Then again, if I were going to put in two heaters, I would do one in the block and one on the oil pan rather than two in the block.
Ha! If you put two heaters in, I doubt you can run them both on the same circuit. Be especially sure to check on it if your house is older and runs 15 amp circuits instead of the newer 20 amp circuits.
Besides, frankly, I question the need. A few years back I put a quart of dino oil and a quart of synthetic oil (both 5W20) out overnight in minus 20 F weather, both with the Ford seal of approval. The next morning the dino poured like bubble gum and the synth poured like water.
My V10 with synthetic starts just fine at the occasional 20 below, with no moaning or groaning at all. Of course, if you're in Alaska/Canada and talking 40 below, all bets are off!
When I was in Fairbanks years ago, I had a block heater, a radiator hose heater, an oil stick heater and a battery heater. At night, I would hook all of them up to one HD extension cord and all worked. That was on a 1972 Chevy 25 350 4-speed in 1974 working on the first and so far, only Alaska pipeline project. The parking meters have plugin's in downtown Fairbanks for a reason.