As a general rule, that is my opinion when it comes to most additives and "miracles in a can."

But I have never seen an ad for Lubro Moly products. If I had not heard about DP here, I would have never heard about it. So if they are spending all their profit on marketing, it doesn't show.

The first time I used Diesel Purge, it went in clear and came out black. So it must have been cleaning something. And my engine performance was most definitely improved. The second time I used DP, 6000 miles later, it went in clear and came out the same way. There was no noticable improvement in performance.

If spending $8 for a can of DP is going to lead to financial distress, don't take the risk. Just think, for that kind of money, you could fill you tank to the 1/8 full mark!!!