123psi is optimum? For what?

My near 300000 mile M103 still was in the 160-170psi range.

Try a new tester. Are you sure you are operating it correctly... plugs out, throttle fully open, etc

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]