Yamaha Marine Gear Lube

Yamalube Marine Gear Lube

Wondering what oil to use in your outboard motor’s lower unit? Go with what Yamaha made for the job—Yamalube Marine Gear Lube. This stuff is built to hold up in brutal marine conditions. It fights off water intrusion, keeps your gears from grinding, and helps your outboard last a whole lot longer.

Quick Tip: Don’t use just any gear oil in your outboard. Regular gear oil breaks down fast when exposed to water. Yamalube is marine-specific and trusted by Yamaha for a reason.

If you’re serious about keeping your Yamaha outboard running strong, high-quality gear lube isn’t optional—it’s essential. The lower unit takes a beating out there. Without proper lubrication, friction builds up, heat increases, and before long, parts start wearing out faster than they should. That’s where Yamalube comes in. It’s designed for these exact stresses.

We’re not just talking about oil here. Yamalube marine gear oil is the real line of defense inside your outboard’s lower unit. It resists pressure, holds its consistency when water sneaks in, and prevents the kind of metal-on-metal damage that can take your boat out of commission in a hurry.

YamahaOnlineParts.com is proud to offer factory-authorized Yamalube products—gear oil that meets Yamaha’s OEM standards. You’ll find it in both quart and gallon sizes, plus complete kits to make the job easier. Whether you're out for a casual weekend cruise or pushing your boat hard through saltwater, this is the gear lube your motor was made to use.

And because we know outboard maintenance can get overwhelming, we’ve pulled together a few helpful resources to guide you:

FAQs: Common Questions About Yamaha Gear Lube

What’s the best oil for an outboard lower unit?

If you’re running a Yamaha outboard, the best choice is Yamalube Marine Gear Lube. It’s built by Yamaha to resist water, protect against corrosion, and hold up under serious gear pressure. No guesswork—just the right oil for the job.

How often should I change Yamaha gear lube?

Change it after your first 20 hours with a new motor, then every 100 hours—or once a year, whichever comes first. If you’re boating a lot or running in tough conditions, don’t stretch it.

Can I use auto gear oil in an outboard?

Nope. Automotive gear oil doesn’t have the right additives to fight off moisture or handle marine stress. It’s cheaper, but it won’t protect your motor—and that could cost you a lot more later.

How can I tell when my gear oil needs changing?

Open the drain screw at the bottom of the lower unit. If the oil looks cloudy or milky, smells burned, or has visible shavings, it’s time to swap it out. Milky oil usually means water’s gotten in.

How do I change Yamaha lower unit gear oil?

You’ll need a drain pan, a gear lube pump, and new crush washers. Remove the lower and upper screws, let the old oil drain out, then refill until it starts to trickle from the top vent. Reinstall the screws with fresh washers. It’s messy, but not hard.

What should I check on the lower unit while I’m at it?

Look for fishing line around the prop. That’s a sneaky cause of seal failure. Also check the oil’s color and smell. Any signs of water or metal in the lube? Might be time for a pressure test by a Yamaha dealer.

Why buy a gear lube kit instead of just the oil?

Kits come with everything—oil, washers, pump attachments. Saves time, avoids hassle. Plus, you know the parts are made to fit your outboard correctly.

TL;DR: If you want your Yamaha outboard to run clean and last long, Yamalube Marine Gear Lube is the only oil you need. It fights corrosion, handles water, and keeps gears turning smooth. Change it every 100 hours or at least once a year.

Here’s the thing—boats aren’t cheap to fix. But they’re even more expensive when you skip basic maintenance. And the lower unit? It’s one of the most important (and costly) parts to replace. Using the right gear oil, and changing it on schedule, helps avoid breakdowns and keeps your boat ready for whatever’s next.

We stock a wide selection of Yamalube Gear Lube Kits that make it easy to get it right the first time. Whether you're wrenching in the driveway or trusting your local mechanic, YamahaOnlineParts.com has your back—with genuine parts, expert support, and fast shipping.