Harley-Davidson Milwaukee-Eight owners looking to boost engine performance, reliability, and cooling efficiency should take a serious look at Feuling Parts’ latest Center/Water-Cooled Oiling System Kits. Whether you’re chasing podiums or simply pushing your motor hard on the open road, Feuling’s HP+ and Race Series kits deliver industry-leading oiling performance that addresses key weaknesses in the stock system.

Each Feuling oiling system kit is a complete solution under a single part number, designed to dramatically increase oil pressure, oil volume, engine oil flow, and scavenging efficiency. Riders can expect improved power and smoother, quieter engine operation. According to Feuling’s in-house testing, the system delivers up to 2 horsepower and 2 ft-lbs of torque gains at the rear wheel, while also showing a 50% reduction in engine sump oil level.

At the heart of both HP+ and Race Series kits is Feuling’s High-Flow billet camplate, CNC-machined from ultra-tough 7075 aluminum—50% harder and stronger than the OEM unit. Complementing this is a high-volume billet 6061 aluminum oil pump, featuring 30% more pressure gear volume and 53% more scavenge gear volume compared to stock. The result? More consistent oiling and reduced wet sumping, blow-by, and oily air cleaners—common headaches for M8 owners.

The system also optimizes oil routing by enlarging pump reservoirs and precisely matching critical oil passage ports between the camplate and engine case. This design boosts flow to lifters, crankshaft, rod bearings, and piston cooling jets, contributing to 15–30°F cooler oil temps and up to 10–30 PSI more oil pressure overall.

Another standout feature is the magnet-equipped oil pump, which protects internal components by trapping debris before it can damage gears or pressure relief valves. Feuling bench-tests every pump to ensure relief valves are seated and sealed properly, popping off at 55–60 PSI.

The HP+ Series kit is ideal for performance street builds, including lifters, cam install hardware, cam bearings, crank bolts, washers, and Feuling’s premium assembly lube. For more extreme racing or high-load applications, the Race Series kit delivers even greater performance potential.

Feuling’s oiling systems are a must-have upgrade for serious Milwaukee-Eight riders and builders. By eliminating the factory system’s pressure and scavenging issues and optimizing oil flow throughout the motor, Feuling gives riders the confidence to run hard—without running hot.