Plastic cap for the oil - but it rattles a metal one too pretty good.

Putting in a parts car engine when you dont know oil consumption is nerve wracking for sure! The donor engine has like new compression - 380 all across.

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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