Quote Originally Posted by crazy_boy View Post
it would really depend on where you load up. if the station is old already, chances are the storage tank is full of rust already. for me, i used to change fuel filter every 10k km. but upon checking, the filter is still clean. the diesel is also clean. so i extended to 15k km fuel filter change now and observe the quality of the filter after 15k km. using seaoil diesel. cleanest compared to the big3 so far.

Thank you sir. I have seen a used fuel filter element, it becomes yellowish in color and has a black soot in one portion of the element. Is this already considered a dirty fuel filter element?