I'll replace the 109. I have not even looked at it yet, so I don't know which one is in the car currently. I'll order one either way. I have not replaced the filter. The PO told me it was replaced, but based on some of what I've come across while getting this car running, anything's questionable. I will say that the filter does not look old, but I understand that means zero about what it might be like on the inside. I actually have a new filter, I just haven't put it in yet. I have had intentions of doing it(naturally), but just haven't yet.
As far as the 'no glow plug light' goes ... that hasn't happened since the time I mentioned it. I thought I updated that in one of my posts, but I can't remember. If I did not, I apologize. I do not know why there was no glow plug light that day, but there was no 'service engine' light either, so there was some odd snaffu going on. Both lights do come on now, and thanks to a missing EGR(with no tune) the 'engine' light stays on and the glow plug light flashes constantly if the car is running due to undetermined reasons. I have checked all bulbs, so I don't know if it is possibly tied to the missing EGR valve or something else. I'm going to order a 'grey' 109 and change the fuel filter for starters.