I have a better idea.
Figure out how to stop the fuel flow if it gas.
**If it is diesel don't bother.
Fog the engine if it is gas.
**If it is diesel, this is tricky as it will start and run on the fogging oil.
Then, leave it alone. Engines only survive just so many thermal cycles before things start breaking. This is why the old lady that drives a short ways to the market and church has so much car trouble.
As a ship's engineer that came ashore so he could have a family, one thing I learned was that the lacquer that was hydroscopic (so you had to warm up windings) when out at the end of WWII. So, that is no excuse (I don't care what the people that sell parts are telling you.)
Matt