Bent rods, sadly. You probably didn't do anything by washing it if it
was already using oil.
The pistons will go crooked in the bores when the rods bend, and very
shortly the cylinders are oval instead of round, at which point they
both loose compression and start to clank horribly.
Mine, at last check, has no blowby at all at idle (263,000 miles this
week), but has had synthetic oil for many, many miles.
I personally believe it's the "smuck" in the intake that bends the rods
-- globs of oily soot that get sucked into the combustion chambers and
bend the rods from zero clearance for a couple times around. The EGR
valve doesn't help any.
Peter
