I often wondered the same question about my 2003 if this came up, plan on keeping this one a while. My wifes older VQ never a problem with anything till sold. I owned an older 1997 isuzu rodeo from new and as the miles crept up the same thing happened knock and a tick (would tick always), seemed to be common on isuzus with engine tick and lifters. This happened even with scheduled maintenance, and some extra fluid/oil changes if the truck was run hard. I did the Seafoam and oil change trick and the engine ran great afterwards when sold 2 years later. I still have a 2002 rodeo just as abused as the first rodeo (comuter car/everything truck), and at 125,000mi the same thing and using the Seafoam worked the same. So far so good, 140,000mi and runs great no tick. These engines were the 3.2L Isuzu, my question is: On the VQ engine can you use this treatment?