Originally Posted By: andyd
Any damage due to sitting was done on the first start. Old oil gathers moisture and acids frome use and sitting. 15$ at Malwart or Auto Zone will solve this. You mention a locked up engine. Did this happen after being revived?
Engine oil has additives to neutralize acid combusiton products as you already know. Unless the oil was run way past any reasonable service life, TBN would have been sufficient to neutralize any acids formed, and they are only formed in a running engine.
TBN isn't degraded nor TAN increased in an engine that isn't running.
Any moisture is evaporated out of the oil in the first drive of any decent length.
On cars that I've stored winters, I just run the thing into the garage after a good drive, put it on a battery tender and leave it alone until spring. This will typically mean that by the time I change the oil, it'll have only 3K on it.
In the spring, I'll return the car to service and change the oil after maybe 200-300 miles.
Never had a problem in doing this.
I don't think that the OP's engine problems are related to the oil.