I have a VW Mk7 TDI that I bought used as part of the VW DieselGate buy back, had 25000 miles on it, and I had it inspected before buying. I had my mechanic change out the fuel filter at the time of purchase. He eyeballed the canister and fuel tank and said the fuel looked fine. Now 15000 later, I decided to change out the filter. Upon removing the old filter I did not notice that the filter was all that dirty but it did have a slight yellowish ever so slight brownish discoloration. I've seen filters that are almost brown at times.
There was about a half liter of fuel left in the canister and I used a sterile irrigation syringe that we use in the operating room (this was clean and was to be thrown so I took it home) and aspirated the rest of the fuel, and poured it over a funnel that I lined with a cone type coffee filter. The first 200-300 ml's of fuel filtered through but I noted that the filtration slowed down considerably after that. In the end, the filter had a very faint/fine brownish deposit on it. The bottom of the canister also had that deposit and I wiped it off with a clean cotton cloth. The residue was fine like wet dust; nothing gritty. I put the new filter in, poured some diesel purge from LiquiMoly, and did a fuel pump prime with VCDS.
Question is, is diesel fuel supposed to be a little dirty? I am now tempted to change the fuel filter out more frequently; like with every oil change at 10K.
Advise appreciated.
There was about a half liter of fuel left in the canister and I used a sterile irrigation syringe that we use in the operating room (this was clean and was to be thrown so I took it home) and aspirated the rest of the fuel, and poured it over a funnel that I lined with a cone type coffee filter. The first 200-300 ml's of fuel filtered through but I noted that the filtration slowed down considerably after that. In the end, the filter had a very faint/fine brownish deposit on it. The bottom of the canister also had that deposit and I wiped it off with a clean cotton cloth. The residue was fine like wet dust; nothing gritty. I put the new filter in, poured some diesel purge from LiquiMoly, and did a fuel pump prime with VCDS.
Question is, is diesel fuel supposed to be a little dirty? I am now tempted to change the fuel filter out more frequently; like with every oil change at 10K.
Advise appreciated.