How long does red diesel last? Red diesel lasts up to a year in a well-maintained storage tank. Will red diesel make my MOT fail? If you have purchased a car which you suspect previously used red diesel, or you have ever accidentally used it this could be a valid concern.
On rare occasion, we have seen tanks fail in less than two years and we have seen others well over 30 years. Although a guarantee cannot be made on how long a polyethylene tank will actually last, we know from experience, that the average storage tank will last around 20 years, depending on some of the above factors.
mkFSN.