I'm adding oil like crazy...3 qts in the last 1000 miles. Got good oil pressure, no oil in the coolant, no blue smoke coming out the tailpipe, no leaks on the driveway. Where's all that oil going? And where can i get a metal oil fill cap - my plastic one is cracked?

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'87 BMW 325 convertible (162k + miles)
'87 300E, 144k + miles (sold)
'93 Chevy Blazer (full size), 207K + miles
'89 Sea Ray 390EC, 2 x 454's, 1550 hours...
'85 AMF Sunfish

Olde Towne Portsmouth, VA