No problem with the V-10 engine. Lots of great commercials, showing the before and after spray patterns, making it pretty convincing.
I have used the product in my Expy 5.4l engine but I'm not sure it really made a difference in either fuel economy or performance.
I still drive a city runaround Volvo 740 turbo with a factory add on Performance Plus pkg to enhance the hp up almost 30%. It required high test fuel and with 480,000 miles later, I think, running a better grade of fuel has led to its longevity.
Lots of debate here.
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Bob and Better Half
2006 32' Crossroads CrossTerrain
2007 F-250 CC LB SW Power Stroke
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