my father's 97 s280 started slipping in 4th gear... when i checked the tranny fluid it had a silvery look to it... kinda like metallic dust mixed in with the atf...
about a yr or less ago he had a ring/helical in the tranny(don't remember exactly) changed...
the metallic stuff may well have come from the breaking in of that particular gear... is this bad? could contaminated atf cause slipping? we're hoping a fluid and filter change would eliminate the slipping.

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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