its definitely not a passage. when looking down on the block, around any of the cylinder bores, i can see the faint outline of the cylinder bore sleeves. (are the sleeves supposed to be separate from the block? or have mine been resleeved) The oil is seeping between the block and this outline(cylinder bore sleeve). makes sense?

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project