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Oil heaters don't heat the block very well. The block is what needs to be warm to start a diesel. (block + heads, good heat conductivity between the block and heads, heating block heats heads too). Heating oil helps prevent slow lubing at the start, but doesn't help much with starting. I had 550...

Usually the engine block drain on these things is a pain to get out. It's on the Drivers side, under the exhaust manifold towards the front of the engine. I just pull off a rad hose, it's wayy faster. Freeze plug block heaters are BY FAR the best for heating vs power usage. I have two of them...