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I wouldn't use engine assembly grease for this. Assembly grease is a very light grease designed to dissolve in oil. It is used to assemble engines and provide lubrication for the first crank over before oil is circulating. It is good stuff to have on hand though for when you want something heavier than oil but not as gummy as the nlgi 2 grease used elsewhere on your bike.
You do need grease on pedal threads. It can be hard to get your pedals tight enough without grease (torque specs assume lubricated threads) and without grease chances are you will have trouble removing the pedals in the future when the need arises.
Any general purpose grease will do. If you have automotive wheel bearing or boat trailer grease on hand either will work. I don't think much of expensive bicycle specific boutique greases. I find that a 1 lb can of general purpose or marine works as well and a couple bucks gets you a lifetime supply (assuming you keep it clean). I'm partial to marine grease for bearings because it washes out less. Note that Bullshot and Phil Wood bicycle greases appear to be repackaged marine grease.
Probably would not use Chain lube. Sometimes the pedals come with a little tube of grease.
I would go by the manufacture. Depending what they are made of and what they are going into it could cause galvanic reaction and seize. A heavy grease should be ok, like water pump or bike bearing grease. For steal in aluminum anti-seize compound is good, you can get really little tubes. This is not for bearing or to lube a surface it to prevent seizing.
First off, full disclosure: when it comes to maintenance, I'm a complete idiot.
Now the question: I need to replace the pedals on my touring bike. I've been told to put assembly grease on the threads of the new pedals to keep them from seizing. I won't be able to get any grease until Thursday. Can I use chain lube temporarily until I can get some grease? Also, what kind of grease should I get?
"It's cyclocross. You're supposed to roll around in the mud." CX Magazine