The test vehicle is a 1992 Ford Explorer Sport with a 4.0-liter single overhead cam V-6. Important to note that a cleaning and rinse with Auto-Rx^® was performed prior to the test.

Next, a short run on Mobil 1SUV/ 5w 30 was performed to establish the norm of this particular motor. This run on Mobil 1 was for only 1,434 miles but was sufficient to point out a couple of issues that needed to be corrected. The analysis revealed that fuel dilution was the biggest issue and contributed to high copper readings from bushing wear. Also, even though the air filter had been changed out only 8,000 miles ago, dirt ingress was an issue. Prior to starting the Auto-Rx^® Maintenance dose with Pennzoil Platinum, new plugs, wires, and PCV valve were installed. A new air filter was installed halfway through the maintenance dose run, which was for 6,101 miles.

Despite the tune-up parts, the motor still suffers from a fuel-dilution problem, although greatly improved. When looking at the numbers, bear in mind that the second run with the maintenance dose (3 fluid oz.) was run for a duration of 4.25 times the mileage as compared to the control.

The combination of Pennzoil Platinum and Auto-Rx^® shows exceptionally low-wear metals, with the exception of copper, which is still due to fuel dilution. It is very likely that the maintenance dose is providing additional protection of the cylinders and bearings. It is also important to note that the additive package of the Pennzoil Platinum is not compromised at all with the Auto-Rx^® maintenance dose and, in fact, may be somewhat  preserved. Slightly elevated oxidation readings would indicate that the maintenance dose is doing some additional cleaning.

If not for the fuel dilution issue, this oil would be very healthy after 6,101 miles and would have service life remaining. Without a doubt, Auto-Rx^® is fully compatible with this Group III synthetic oil.

Look at the PDF file from D Y S O N A N A L Y S I S