I don't post much, but I have used Auto-Rx in quite a few vehicles over the years and thought I would post the "long term" results for some of the vehicles. I have used in gas and diesel engines with great results (some vehicles are owned by friends and family). Here are a few:

1993 Ford Thunderbird 5.0L V8:
Symptom: Oil leak & poor fuel mileage (15-17mpg)
Mileage on vehicle at treatment: 85,000
Current mileage on vehicle: 125,000
Follow-up: The owner still reports that the car does not leak oil and fuel mileage is around 20mpg or above.

1990 Nissan Pathfinder V6:
Symptom: Lifter noise at every startup
Mileage on vehicle at treatment: 120,000
Current mileage on vehicle: 141,000
Follow-up: The owner reports that the lifter noise only happens every once in a great while.

2001 Ford F350 7.3L PowerStroke Diesel:
Symptom: "oil in the Valley"
Mileage on vehicle at treatment: 100,000
Current mileage on vehicle: 112,000
Follow-up: The oil leak seems to have stopped as the valley in the middle of the engine remains dry.

1998 Ford Mustang GT 4.6L V8:
Symptom: Very poor running engine - dealer said that engine is full of sludge
Mileage on vehicle at treatment: 65,000
Current mileage on vehicle: 90,000
Follow-up: The owner reports good performance with no engine related problems.

When my next shipment gets here, I will be using it in my 1999 Mercedes C43 AMG. No problems to report, just doing it as a preventative maintenance thing.

Brandon -Intelman34