sorry to hijack for a sec... looking at their website i see different directions for high mileage and diesel seprate so what do i do with a 306,000 mile diesel and does it really do all they say it does
As far as does it really do what it says, a resounding YES!!!
I have brought a few diesels back from near death from the boneyard with that stuff. I took one diesel car that inhaled a qt of oil every 15 miles and wouldn't even pull top gear and was the town skeeter fogger and turned it around to where it used a qt every 800+ miles ( acceptable for a new engine by factory spec). My truck when I bought it went from around 130 psi on a couple of cylinders to over 400 after treatment. Ring job in a bottle
I can't even begin to count the number of seal leaks and low compression problems I've taken care of with that stuff on mine and customer cars. Every old diesel out there should get the Auto Rx treatment. the difference in cold starting will be like night and day.
I had to tear into a European diesel that had got the Auto RX treatment recently and I was able to clean out the ring grooves with a can of brake cleaner. A few months later I had to go into an identical engine that had been on Mobil 1 for all of 70k miles and I spent a WEEK chipping away at the ring grooves with the ring groove cleaner before I could put the new rings in. The ring grooves were that packed up on a quality synthetic. Imagine what they look like with a few hundred thousand on dino oil
The diesel instructions are generally enough the high mileage .sludge removal instructions are for just that. For REAL sludge pits. For specific instructions for your application if you get confused, you can look on the website and you can give Frank a call, and you can actually talk to the guy who invented the stuff. Interesting fella.