Thank you - defintely the shutoff valve replacement is well covered.

Does this mean certain death for the now oil rich lock cylinder (what is the part that the tumbler goes into officially called?)? Should I just replace it?

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car