Join Date: Oct 2004
Location: Stratford, Connecticut
heat alone doesn't cause moisture. That's a fact. The only two places moisture can get inside an engine from are (a) byproducts of combustion blowing by the rings into the sump, (b) moisture from the air going in through the breather
Having a block heater plugged in will NOT magically create moisture where there is none. If there IS moisture in your engine the block heater probably won't make it hot enough where it matters to drive the moisture back into vapor.
The reason the Canadians and probably everyone else says don't use a block heater all night is for energy conservation, nothing else. If the block heater can warm the engine as much as it's going to in say 2 or 3 hours then there's no point in keeping the engine warm for 12 hours. Less energy used = lower electric bills, less pollution from the power plants etc etc.
The moisture in the oil will combine with sulfur and other byproducts to form acidic compounds. This happens whether you have a block heater or not. That is what the TBN number in oil is for, that's total base number - Base being the opposite of an acid and the combination of the two cancel each other out and leave a salt of some sort.
The only way to ensure that moisture is driven out of the engine is to drive it at a rate that gets the engine good and hot, any moisture will evaporate and hopefully get either blown out of the breather or sucked in through the PCV valve into the engine.
Changing the oil on a regular basis is a very good way to ensure there is no buildup of acidic compounds in the engine.
2004 Colorado Z71 LS Crew 4X4 (Born May 26th)
Line-X over the rail
3M no-chip film on various surfaces
Supertone Horns installed! Loud!
Custom Skidz 3 pc set installed and tested!!
Torza premiere tonneau nice!