Hi everyone. Been reading this forum for a long time but haven't posted before. Hoping you might be able to help figure something out. I have a BF Typhoon which was recently serviced. I supplied all the parts because I wanted to be sure of what was going into it. My question is, do these look like the plugs of a car that was serviced less than 1500kms ago? They seem a bit older than that to me due to the corrosion showing around the base of the ceramic, but I want to be sure before I go back and say anything. Anyone more familiar with these than I am?