uneven tightening may also cause that gasket to leak... you may have inadvertently crushed that side of the gasket to oblivion... maybe a new gasket is in order? IF its leaking at the gasket

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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