I'm not sure how you would check the oil tube fittings. If you have the cover off, suggest you simply replace them.

Also, a 1/4" drive torque wrench is a good investment to do the bolts that hold the cover to the head. And a new gasket and washers are a good idea.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe