How to Change the Oil on Your Harley-Davidson: A Step-by-Step DIY Guide

TL;DR: A Harley oil change takes about 30 minutes with basic tools: a socket for the drain plug, a filter wrench, a drain pan and a torque wrench. Warm the engine, drain, fit a new filter, refill to the dipstick mark, then take the used oil to a déchèterie. This guide covers the job itself. For which oil to use and how often, follow the links below.

Changing the oil on a Harley is the first job most riders learn to do themselves. It's simple, it saves a shop visit, and it tells you a lot about your engine. This guide walks through the procedure step by step. It does not cover which oil to buy or how often to change it: our Harley oil change guide handles the oil choice and our interval guide by model handles the timing. Here, we get our hands dirty.

What tools do you need for a Harley oil change?

You need a ratchet with the right socket for your drain plug, an oil filter wrench, a drain pan, a funnel, a torque wrench and a rag. Add the fresh oil, a new filter and a new drain-plug O-ring or washer. Nothing here is special-tool territory.

The J&P Cycles Milwaukee-Eight walkthrough lists a 3/8-inch ratchet with an extension, a 5/8-inch socket, a filter wrench and a torque wrench. Older engines may use a different plug size, so check yours before you start. Order the O-ring with your oil filter: if the old one leaks, all the fresh oil comes back out.

Step 1: Warm the engine and drain the oil

Run the engine for a few minutes or take a short ride. Warm oil flows faster and carries more debris out with it. Park on level ground, pull the dipstick to let air in, and place the drain pan under the plug.

Find the right plug

On a Milwaukee-Eight Touring model the engine-oil plug faces forward on the left side of the transmission oil pan. Pick the wrong one and you'll drain the gearbox instead. On a Softail the reservoir sits under the seat, with the plug just below and behind it. If you're not sure, your owner's manual shows the location.

Read the plug

Most Harley drain plugs carry a magnet. Wipe it and look: a fine grey paste is normal wear, metal flakes are a warning sign. Let the oil slow to a drip, then fit the plug with a new O-ring so you don't forget it later.

How do you change a Harley oil filter?

Unscrew the old filter with the wrench, catching the oil that spills out. Smear a film of fresh oil on the new filter's rubber gasket, thread it on by hand until the gasket touches, then turn it another half to three-quarters of a turn. Hand-tight is enough. No tools, no over-tightening.

That half-to-three-quarter turn after contact is the figure AMSOIL uses in its Softail demo, and it matches the printed instruction on most filters. Then torque the drain plug. The J&P Cycles guide quotes 14 to 21 foot-pounds (19 to 28 Nm) for the Milwaukee-Eight; other engines differ, so use your manual's figure. Over-tightening strips threads, which is a far worse day than a small drip.

Step 3: Refill and check the level

Pour in slightly less than the full capacity, then top up to the mark. Overfilling makes the oil foam and can push it out through the breather. As an example, AMSOIL's 103 Softail demo calls for three quarts, starting with two and a half. Your model's exact figure is in the manual.

Check it the Harley way

Start the engine, let it run a minute, then take a short ride. Check the level hot, with the bike on its jiffy stand unless your manual says otherwise, and top up as needed. Look under the bike for drips at the plug and filter. Browse our range of Harley oils and fluids if you still need to stock up.

Note that this is the engine oil only. The primary and gearbox use their own fluids on Big Twins. Our primary and gearbox oil guide covers those.

What do you do with used oil in France?

Take it to your local déchèterie. Pour it into a clean, sealed, leak-proof container (an empty oil can works), keep it separate from other fluids, and drop it in the used-oil collection point. It's free for private individuals, and the oil is refined into new lubricant.

ADEME's guidance is clear: never mix used oil with coolant, brake fluid, fuel or water, because that stops it being recycled. Pouring it down a drain or on the ground is illegal, and local authorities list fines of up to 900 euros. Most déchèteries also take the old filter; ask at the gate.

Ready to do your own oil change?

Warm it, drain it, read the plug, fit the filter by hand, torque the plug, fill to the mark and check hot. That's the whole job. Keep the used oil for the déchèterie and you're done in half an hour. Grab a new oil filter and the right Harley oil before you start, and if you're unsure which one fits your model, send us your year and model.

Frequently asked questions

Do I need to warm the engine before draining the oil?

Yes. Warm oil drains faster and carries more contaminants out. A few minutes of idling or a short ride is enough. Be careful, the exhaust and oil will be hot.

How tight should the oil filter be?

Hand-tight only: oil the gasket, thread it on until the gasket touches, then add half to three-quarters of a turn. Never use the wrench to tighten it.

What torque for the drain plug?

The Milwaukee-Eight spec quoted by J&P Cycles is 14 to 21 foot-pounds (19 to 28 Nm). Other engines differ, so check your manual and always fit a fresh O-ring or washer.

Should I check the oil level hot or cold?

Hot, after a short ride, with the bike on its jiffy stand on most models. Your manual states the exact procedure, and it can vary by model.

Where do I take used motorcycle oil in France?

To the déchèterie, in a sealed container, unmixed with other fluids. It's free. Dumping it in nature or down a drain is illegal and can cost up to 900 euros in fines.