To Change or Not to Change?

Use it just make sure you had spare filters just incase. It should be fine I had a tank just about 1/10th the size 5 years old with same dilemma. The engine ran fine,

I am sure someone will offer to have it from you if you decide to change.
@Sandy Got there before I could post, but you will get better offers if you wait!
 
I think my diesel tank was last filled about 2016 with anti bug treatment added. Engine started and ran smoothly on this up to a couple of months ago when new owner took over.
 
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