I've got a 1.6L honda motor in my 1991 CRX that has become a severe oil consumer. When I first noticed the oil consumption, at around 235k, it only would smoke out of the tailpipe whenever I was above 5500 rpms and under load. Now, with around 248k miles, it smokes out the tailpipe at anything above 2500 rpm and even with the slightest load. A good time for ARX I thought. I'm about 600 miles into the first cleaning phase and it appears that the oil burning is a bit worse during the cleaning phase. Is this to be expected? After 600 miles of the initial cleaning phase, I've driven conservatively and used about a quart of oil, should I be adding 2 oz. of ARX for each qt of oil that I replace? I have a feeling that this motor is suffering from either worn valve seals/guides or worn out oil rings on the pistons. I've checked static compression on the bottom end and it is very good with very minimal deviation from cylinder to cylinder (220 psi +/- 5 psi). I've also had a leakdown test done on the motor recently and it passed with flying colors. I would imagine that if air from a leakdown test would not make it's way past the piston rings, then oil would NOT be able to get by the rings during engine operation. I've seen oil piston rings on these little motors and they look pretty robust, I have a hard time imagining that these would EVER go bad. My question is this; how do I pinpoint where my motor is using oil from, the head or the bottom. It would be extremely easy for me to pull the head and rebuild it, but that would also be an opportune time to remove pistons and replace the ring packs. The later would be more time consuming and would cost more money in addition to the head work. What symptoms do I look for to determine where my motor is using oil from? Sorry for the length, I just need a good educated answer.