Are oil marks close to engine bay door normal?
Yes, the Taurus 503's engine runs on fuel/oil pre-mix which contains 2% of oil. When the engine runs on full power (tipical for take off and climb) small amounts of fuel/oil mixture escape the carburettor through the filters and through the exhaust. It deposits on the nearby fuselage structure, close to the engine bay door. The fuel evaporates, however the oil remains in form of small localized stains which pose no hazard to the surface, structure or flight safety. This is a completely normal phenomenon.
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