Those are all good ones to check. I don't trust computer "compression" checks. What happens if all cylinders are low? The way the pressure jumps up with each compression stroke can give a clue to what's wrong, and you can test for rings or valves by adding tsp of oil to each cyl. and retesting compression. An improvement means rings, none means valves/head gasket/cracked head. A better test is a cylinder leakage test, which tests the cylinder's leakage rate after the application of regulated pressure. The sound of escaping air will often lead you to the leak (from the radiator, crankcase, exhaust pipe, carb, etc.). Have they scoped the ignition?<BR>The oil consumption is puzzling. Is it smoking from the tailpipe, and is the inside of the pipe very sooty black, or oily black. What does your undersheild look like? Any drips or puddles? Are the plugs sooty, white, or normal light tan? Are the electrodes pitted or smooth? Do the white central insulators have tiny shiny metal flecks on them (sign of detonation). Are all the plugs the same? One very white one is usually a head gasket water leak. Does the engine spin smmothly when cranking, or with a weak spot?<p>[ 06 December 2001: Message edited by: fasteddy ]