As usual outstanding advice from everybody - thanks for providing info i need regarding camshaft upgrades from '79 - '82.

I should have thought about pulling the oil tube and giving it kerosene bath and toothbrush scrub when in there for valve adj. Gotta go back and do this. Meanwhile I'll bide my time for junkyard cam, stantions and tungsten acorns from '82 model.

Have experienced camshaft wear before - on my twincam 280/8 - so can calculate I've probably got 20,000 miles left (i hope) on camshaft lobe that shows minor wear.

Bit of vintage lore the forum might enjoy - primitive finbody diesels of early '60s had hollow camshaft that shot oil through holes on the back surface of lobes instead of external oil tube. Oil was channelled through one stantion to another and down the last stantion directly through the camshaft that also shot oil directly on camshaft followers.

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'80 300SD/ w116
'79 240D 4-spd
'71 750cc Guzzi

previously owned:

'83 240D 4-spd
'77 280SEL 4-spd
'74 280/8
'72 250/8
'65 220Sb 4-spd
'63 220Sb 4-spd
'63 190c 4-spd
'61 220Sb 4-spd
'60 190b 4-spd