Would removing the cross over pipe eliminate the turbo oil seal cause? Have you tested for blow by? Oil cap test?

Whats your oil pressure?

My 1990 300D had no teeth on the oil pump sprocket at 283K miles.

Good luck!

__________________
James
Jet Engine Design Engineer with a car problem
(I just wish it was curable!)

1990 300D 294K miles
1987 Vette 101K miles (4+3)
2003 HD Electra Glide 65K miles
1992 Ford F150 300 I6
2000 Suzuki TL1000R Human Missle Machine!