I use it, I use the Engine oil and Gear oil in my 5 speed transmission. I've used it in my high mileage TT and when used with "engine Flush" and injector cleaner, by the middle of the second oil change my 84,000 mile 1990 Nissan 300zx TwinTurbo ran so smooth that friends that just got in the passenger seat would tell me "Start the car already!" but she was already idling. So i, myself have had great results with it.
I've also used it in my 40,000 mile Eclipse Gst and before changing the oil to RP, i had to remove the valve cover to replace sparkplug Orings and seen how brown the cam lobs were stained from age and such. After replacing the valve cover and using RP for about 3500 miles, i had to take care of the Oring issue again so off came the valve cover and the cam lobs looked like they been polished so that there told me the polishing claim that RP mentions is no joke... I would tell you how the internals looked of the block but I've never had a complete engine failure since using RP.
Got to love that polishing feature the RP has!
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