Oh, well if it was a upright engine, I,d say a teaspoon of oil down the cylinders, haven't done it with a diesel
, never needed to and could be difficult getting it in, although a spray on the other side of air filter could work
For 2 stroke, Suggest a spray of something with oil in it like CRC or WD40 it doesn't do anything to solve any corrosion
, but it could uncrust a little rust around the piston rings. 2nd reason is help get a good seal to support compression
. Would turn it over a few times with the safety
clip not inserted.