Your Harley doesn't have one oil to check. It has three. The engine, the primary and the transmission are separate compartments, each holding its own fluid, and riders ask about them constantly. So Jules from the Service Department at Trev Deeley Motorcycles walked through all three: Where each one lives, how to read it and the one check you can’t do on the kickstand.

One Bike, Three Oil Compartments

The three compartments split the work. Engine oil keeps the motor alive, primary fluid bathes your clutch and primary drive, and transmission fluid looks after the gearbox. Three jobs, three fluids, and they’re not interchangeable.

So before you check or top anything up, be sure you’re looking at the right compartment. Putting the right oil in the wrong hole is a mistake the Service Department has seen before. On Touring and Softail models, the maintenance schedule calls for fresh oil every 8,000 kilometres. Your service manual has the full schedule for your exact model and year.

Finding the Engine Dipstick

On Touring and Softail models, the engine dipstick sits just below your seat. Different makes, models and years put it in slightly different spots, so the service manual is the place to confirm the exact location of your bike.

Here’s a detail plenty of riders miss: the dipstick itself tells you how the bike wants to be checked. Pull it out and it’s marked for either the jiffy stand, which is Harley’s name for the kickstand, or for holding the bike straight up. Get that part wrong and your reading is off before you’ve wiped anything.

The Check Itself Takes Thirty Seconds

Once you know your spot and your stance, checking the oil is super simple. Pull the dipstick, give it a couple of shakes to knock off the extra drops, gently wipe it clean and re-insert it. Pull it again and you’ve got your level.

That reading is the level with the bike sitting still. Once you’re riding, the oil is splashing around in there doing its job, so still and level is the only reading that counts. Worth remembering before the first dry saturday of a Vancouver spring, when the bike has been sitting for months and everyone’s in a hurry to leave.

Transmission Fluid: Right Next Door

The transmission also checks with a dipstick. On a Touring bike it sits in front of the engine dipstick, which is convenient and also exactly how people end up reading the wrong one. On a Softail it hides behind a side cover, so that has to come off first. If you’re not sure which cap is which on your bike, that's a professional question, not a guess.

Primary Oil: The One Without a Dipstick

The primary is the odd one out. There are really only two ways to check it: Drain the oil, or open the derby cover, the round cover on the primary housing, and inspect what's inside.

One rule is not negotiable here: the bike has to be straight upright. This cannot be done on the jiffy stand. Without a lift or a second pair of hands to hold the bike level, it's harder to check casually in the garage. This is why for a lot of riders, the primary gets looked at when the bike is in the dealership for a full service.

Topping Up on the Road

If you ever find yourself away from home and the level is low, your service manual will tell you exactly which oil to put in and how much. Three compartments, three different fluids, and the manual is the one place where the right answer for your specific bike is written down.

Frequently Asked Questions

How often should I change the oil on my Harley-Davidson?

On Touring and Softail models the maintenance schedule calls for fresh oil every 8,000 kilometres. Your service manual lays out a full schedule for your model and year, and if you’re not sure where your bike sits, call our Service Department and ask one of our professionals.

Why does my Harley have three separate oil compartments?

The engine, primary and transmission each do a different job, so each gets its own fluid. Engine oil protects the motor, primary fluid runs the clutch and primary drive, and transmission fluid looks after the gearbox. They’re checked separately and filled with different products.

Can I check the oil with my bike on the kickstand?

Sometimes. Pull the engine dipstick and it’s marked for either the jiffy stand or upright, depending on your model. The primary is the exception: it can only be checked with the bike straight up, never on the stand.

Where is the engine dipstick on my Harley?

On Touring and Softail models it’s just below the seat, with the transmission dipstick nearby. Exact locations vary by model and year, so the service manual is the reliable answer for your specific bike.

What oil should I use to top up on the road?

Whatever your service manual specifies for that compartment, in the amount it specifies. The three compartments take different fluids, so it’s worth knowing what your bike needs before a long trip. Our Parts Department can set you up with the right oil to carry along.

Not Sure What You’re Looking At?

That’s a phone call, not a problem. If you pulled a dipstick this week and the level or colour made you hesitate, or you’d rather have us go through all three properly, give our service department a call at 604-291-2453 to book an appointment. You can also reach us through our service page.

How to Check the Oil on Your Harley-Davidson: Engine, Primary and Transmission