When I first take off the truck runs sluggish. It's leaking oil and I don't understand why. 2 weeks ago I changed the head on it tightend the valves and changed the spark plugs. Now the truck is leaking oil, runs like it has no pick up unless I push it. What is the problem?
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The engine can burn alot of coolant before you see any smoke. And having a cooling leak in the engine could cause it to run hot at times. If you are adding coolant every week and don't see any leaks, the engine has to be burning it. Most of the time it is a blown head gasket and cracked head or block.
Driving the truck without a thermostat won't necessarily hurt the engine. It will take longer to get heat and it will be sporadic because the coolant is always circulating. Oil in antifreeze could come from 2 places, transmission cooler in rad if you have an automatic. The lines inside will occasionally start leaking. The other is from the engine, usually a head gasket leaking. My suspicion is that you have a leaking head gasket. This would explain the over heating with oil in the coolant. Take it in and get a pressure test on the rad or a compression test on the engine. This should confirm or eliminate the head gasket. Hope this helps.
First off your engine should not get "stuck" or seized yes it is bad for your engine too be run until the problem is fixed because the coolant that is in your oil isn't meant too lubricate. Starting the truck isn't really helping anything it is probably better to let the fluids sit in the bottom of the oil pan. As far as the new engine, depending on how much you drive it it could be a couple of weeks to a couple of months. You could drain the engine of oil and coolant and then only refill the oil for storage purposes but the cooling system may dry out and seals could crack and leak. The reason that you are having this problem is the leaky rad and the cooling fan problem, the heat caused your head gasket to fail. You should just park it and leave until you get it fixed although you could start it about every six months if you plan on leaving it that long.