4.6L V8 SeaPro and Pro XS CMS 300 Hour Maintenance Kit

Mercury Marine 4.6L V8 SeaPro and Pro XS CMS 300 Hour Maintenance Kit

Keeping your Mercury 4.6L V8 outboard in peak operating condition is straightforward with the 8M0149931 300 Hour Maintenance Kit. Designed exclusively for SeaPro and Pro XS models equipped with the Conventional MidSection (CMS) and bearing serial numbers 2B529482 and higher, this precision kit eliminates the need to source individual service parts separately. Every component is produced by Mercury Marine to stringent OEM specifications, ensuring a perfect fit and maximum reliability for your Mercury or Mariner outboard.

Periodic 300-hour maintenance is essential to protecting your engine investment and keeping your time on the water trouble-free. This kit makes that service straightforward: all required replacement parts arrive together in one box, and the maintenance can be completed using common shop tools by following the procedures outlined in your owner's manual. Components feature high internal pleat counts for superior filtration and electroplated housings that resist corrosion to extend service life.

The kit is compatible with a broad range of Mercury 4.6L V8 CMS outboards rated from 200 HP to 300 HP, including SeaPro and Pro XS variants (serial number 2B529482 and higher). For a complete service, complement this kit with genuine Mercury 4-Stroke Marine Engine Oil and Mercury Premium Gear Lube (Part No. 858058K01), both sold separately.

Key Features

• Complete selection of required 300-hour service replacement items in one box — no need to order separate parts
• Includes 1 oil filter, 1 high-pressure fuel filter, 1 oil drain seal, 2 gearcase drain seals, 8 spark plugs, 1 thermostat kit, 1 water pump impeller kit, 1 alternator belt, and 1 anode kit
• Also includes low-pressure fuel filter, thermostat gaskets, power trim anode, and lower unit anode
• Components feature high internal pleat counts for enhanced filtration and electroplated housings for corrosion resistance
• Produced to Mercury Marine's OEM specifications to maximize performance and longevity
• Compatible with Mercury 4.6L V8 CMS SeaPro and Pro XS outboards (200–300 HP), serial number 2B529482 and higher
• Periodic maintenance is easy using common shop tools
• Follow your owner's manual for recommended service intervals to keep your engine running longer and stronger