Review on ASL Pt CamGuard Additive Automotive by Viterbo Dashora

I purchased this oil additive because I live in Phoenix where summer temperatures are often in the 110-118 range. I want to make sure I have maximum engine protection so I use it with full synthetic oil and add a small amount after every oil change. It's not as thick and viscous as an STP oil additive, but since one liter is enough for 4 oil changes, it's cheaper per oil change.