Oil Coolers & Lines
About Oil Coolers & Lines
An oil cooler removes heat from the engine oil by passing it through a small radiator in the airstream. Oil that runs too hot thins out and breaks down faster, so riders add a cooler when they tour, carry loads, ride in hot weather or raise engine output. The category also serves riders who need to replace a damaged cooler or hoses.
Coolers are listed by the number of rows, such as 6-row and 10-row, and a larger or taller core has more surface to shed heat. Universal coolers fit many machines but need a mounting spot with airflow and lines that you route yourself, while model-specific kits, such as a low-mount kit for Dyna models or a Polaris cooler, are made to bolt on. In-line coolers are a simpler design that fits into an oil line. Check the line size and fittings so that they match the cooler. Run lines away from the exhaust and moving parts, and secure them with clamps. After installing a cooler, check the oil level, because the cooler and lines hold extra oil.
Brands in this category include Jims, Drag Specialties, Pro-One Perf.Mfg., Pro Design and Goodridge. If your bike is liquid-cooled, see Radiators and Water Pumps in Engine Cooling. Pick your machine in the Ride Finder at the top of the page for kits made for it.
FAQs on motorcycle oil coolers
Do I need an oil cooler on my motorcycle?
Most bikes run without one, because the maker designed the engine to manage its own oil temperature. An oil cooler helps when the engine runs hot in heavy loads, slow traffic or hot weather, or after the engine has been modified. Check your manual and the kit's fitment notes.
What does the number of rows on an oil cooler mean?
Rows refer to the layers of tubing inside the cooler core. More rows give more cooling area in a given size, which helps remove more heat. A bigger cooler also holds more oil and needs more room, so match it to the space on your bike.
Where should an oil cooler be mounted?
Mount it where air flows over it as the bike moves, for example on the frame in front of the engine. Keep it clear of the exhaust, the wheel and anything that could hit it. Follow the kit's instructions for the mounting hardware.
Will an oil cooler change how much oil my engine needs?
Yes, the cooler and its lines add oil capacity, so you may need a little more oil. After installing, run the engine and check the level at the dipstick or sight glass, then top up as needed. Check for leaks at every fitting.
What is an in-line oil cooler?
An in-line cooler is a small cooler that fits directly into an oil line. It is simpler to fit than a full radiator-style cooler, and it needs less space. Use fittings and lines sized for it.
