Well the proces od elimanation has failed to produce any resaults now....
1: wait for oil additives to work ......might take 1500-2000 miles and a second oil change flush...
2: go ahead and takre the plunge and go for the valve shim/clearance thingy..........
3:Wait for divine intervcention and win the lottery and buy new lex ls 400!!!!!!
The tick goes on.....tick tick tick tick tick tick