Hmmm, I'm also curious. Noticed last night that my air cleaner does not seem to be attached to anything below. Have three bolts that come thru, but they just seem to rest on the block/turbo. ??? Also getting some oil in there, so am going to do a search on that...maybe it has some connection with the EGR...Thank goodness for the search function on this board!

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1983 300D- silver blue, tan leather, 205,000.
1975 Datsun 280Z. Stock, ready to restore.
1983 San Juan 23. Dry docked.