Had oil residue in the tank of my TE when I bought it. Took it off and cleaned it up about a thousand miles ago and no oil has resurfaced. So maybe it was fixed before I bought it and no one cleaned the tank. Maybe I got lucky.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K