Mercury - Oil Filter FourStroke Outboard Filtration Steel Canister 877761Q01. Overview. There's a certain comfort that comes from knowing your engine is protected, even before you push away from the dock. When you spin on a fresh oil filter you trust, it feels like setting the tone for the entire day on the water - steady, reliable, and hassle-free. That's exactly why so many boaters stick with this Mercury Marine part. The 877761Q01 Oil Filter gives you that sense of confidence before sunrise,