I replaced my glow plugs 3 weeks ago, and I've tested the relays and all is good. I had this same issue a week ago and the garage I took it to "added oil to the combustion chamber" for $300! It worked very well for a week now I'm very far from home, about 800miles, and am having the sme issues. I'm pretty familiar with the car, swapped out the motor my self and do all routeen maintenance, so I don't think I should have to pay $300 again ot get it started! I can try the wd-40 thing, but I feel oil in the combustion chamber is mor likely what is really needed. it's sittin almost 2 quarts low right now, should I just top it up, or add some in another fashon? has anyone ever added oil to their combustion chamber before?