My g/f has a 1993 Del Sol Si that is burning about 1 qt every 1000 miles.

I tested and cleaned the PCV and did a compression test.

1 180psi
2 173psi
3 175psi
4 175psi

Been running Valvoline MaxLife 10W-30 for the year we have had it, now at 145,000 miles.

Since the rings look ok, I suspect the valves. Is there any products out there like Auto-Rx or Seafoam that could possible clean the valve train or swell up the valve seals. We only paid $2700 for the car so I don't want to rebuild it.