Thanks for the reply. My 4L runs continuously for about 5 years, it has just stoped the last 3 months for some repairs in the painture. I've noticed the sludge in the engine, and would like to fix it. I post a photograph for you to see how it is. Does it look very bad? I'm using the 4L now...
So, I have to remove the valve cover, right? ok, I'll try it.
Let me see if I understand it: I remove the spark plug and fill the engine with diesel. Then I push the key, to let the starter run?
Any more recomendations?
Thanks a lot!