MCS Oil Line Fittings

15 products — part of all Oil Line Fittings

MCS oil line fittings for Harley-Davidson motorcycles address the adapters, nipples, and connector fittings found throughout the engine oil circuit and primary vent — a category where the wrong thread specification or taper causes leaks that ruin finishes and foul clutches. MCS's oil fitting catalogue spans the 1915-1929 IOE-era Big Twins through 1936-1964 OHV and Flathead Big Twins, Shovelhead primary vents, XL Sportster oil pump ports from 1977 to 2022, and universal applications for custom oiling setups. The coverage is the value proposition: whether you're refreshing a pre-unit era oiling system or routing a custom oil cooler feed on a Twin Cam, MCS supply the fitting rather than leaving you to fabricate one. Iron City Motorcycles stocks MCS oil fittings as part of a complete Harley-Davidson engine rebuild supply chain for workshops and home builders alike. Browse the full MCS Oil Line Fittings range below.