Mercury - 300 Hour Maintenance Kit L6 Verado EFI Series Marine-Grade Components 8M0133617. Overview. Most boaters will tell you there's nothing quite like the confidence that comes from a well-maintained engine. When you turn the key and your Verado wakes up without hesitation, there's a calm satisfaction that settles in - the kind you only get from staying ahead on your service schedule. The Mercury Marine part 8M0133617 maintenance kit is built for that peace of mind. It gathers every critical