Thanks Frank. Its not my first rodeo with your product. I tried all the cheap stuff first, and this is the only thing that stops my Prius from ticking. Ive been leaving it in for 10,000 miles And changing the filter every 2000 because the oil is so dirty.I had it to mobile one full synthetic 0-20 and use genuine Toyota filters. My suspicion is that the previous owner let it get really sludgy.
