Mercury - Remote Oil Tank Oil Delivery System Durable Marine Composite 8742A22. Overview. If you've ever run a long stretch upriver or pushed across choppy water with a two-stroke that's working hard, you know how much confidence comes from an oil system you never have to second-guess. The Mercury 3-Gallon Remote Oil Tank 8742A22 is the kind of part that quietly earns your trust. It sits tucked away doing its job without drama - keeping your engine fed, protected, and ready for whatever the day