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Microlon is a metal treatment that supposedly leaves a film in the pores to reduce friction and therefore reduce wear, reduce temperature, increase mileage----the next better than zippers mouse trap???????!!!!
On the + side, Microlon is the only oil additive that I know of that is/was approved by the FAA for aircraft engines (STC). Lifetime additive that I used in my '81 Toy-0-ta, (in '02) and got a note 6 months later from Microlon that said I needed to add a refresher ... Couldn't tell a difference in the truck, mileage or performance. Have since read horror stories about PTFE additives in lubrication systems, plate-out in small oil passages, but I'm not an expert, and if you look long enough, you can find an expert to agree with what ever you want to hear. You gun guys who see an improvement are expert enough for me, but that's not a Cummins diesel application. That's my $. 04, only $. 02 apply. The FAA part is some pretty good credentials.