Error code: cylinder #1 misfire

warm compression test shows cylinder 1 at low pressure (30 psi) while other cylinders are all between 145 - 155. When the engine is cold compression shows no issues and cylinder #1 holds fine at 150psi.

when I pulled the spark plug, there was a small trace of oil on the plug.


whats most likely?

is there another diagnostic test that I can do that might shed more light?

thanks in advance

 

try a cylinder leakdown test. try the test both wet and dry. doesnt sound too good though