4 Best Oil Filters for the BMW R1150RT: Rider-Tested Picks and Buying Advice

I’ve owned and wrenched on oilhead BMWs long enough to know that the humble oil filter gets less attention than it deserves. The R1150RT is a big, heavy, long-distance machine. Its 1130cc boxer twin works hard hauling rider, luggage and a passenger across entire continents.

A good filter protects the engine, and a bad one can leave you with a weeping cover or reduced flow. In this guide I share the four filters I’d trust on my own bike, why I like each one, and what to watch for when you install it.

How I Chose These Oil Filters

The R1150RT isn’t like a modern bike with a spin-on canister. It uses a cartridge-style paper element that slides into a housing at the front of the engine, behind a bolted cover. That limits your choices, which makes quality and fit matter even more.

My criteria

I looked at five things: fit and sealing, filtration media quality, availability, price, and how forgiving the filter is during installation. I also weighed reputation, since I’d rather pay a few dollars more for a known manufacturer than gamble with my engine.

A quick note: always verify the part number against your bike’s model year and the seller’s fitment chart before ordering. Oilhead variants differ slightly, and a few minutes of checking saves a messy afternoon.

1. BMW Genuine Oil Filter 11 42 7 673 541 — Best Overall

When I want zero doubt, I reach for the BMW Genuine 11 42 7 673 541. It’s the filter the R1150RT was designed around, and the fit is exactly right every time. I’ve never had to fiddle with it, and it has never leaked when I’ve installed it with a fresh O-ring.

What I like

The BMW Genuine filter uses a quality pleated media sized for the oilhead’s flow rate and pressure. It’s consistent from one box to the next, which matters if you service your own bike regularly. Expect to pay roughly $15 to $25, depending on the dealer.

It’s also easy to find. Any BMW motorcycle dealer can usually get it, and plenty of online parts shops stock it. That makes it a safe choice if you’re traveling and need a filter in a hurry.

What to consider

The main downside is price. Dealers can mark it up, and buying several for a season of servicing adds up. I also find it’s worth buying the matching O-ring kit at the same time rather than reusing the old one.

Best for: riders who want guaranteed fit, are under warranty or are preparing a bike for sale, and simply prefer genuine parts.

2. Mahle OC 306 — Best Value for Money

If you ask me where I’d save a few dollars without losing sleep, it’s the Mahle OC 306. Mahle is a huge German supplier that makes original-equipment components for many European manufacturers. That pedigree gives me confidence in the construction and the media.

Why it earns the second spot

The Mahle OC 306 is well finished, with clean pleating, solid end caps and consistent sizing. In my experience, it slides into the housing as easily as the genuine part. It typically runs about $10 to $15, so you save a little on every service.

Mahle filters also tend to come with the correct seal in the box, though I always check this. If you service the bike twice a year, the savings over a few seasons are real.

Things to watch

Availability can vary by region, so I like to order a couple at once when I find them in stock. As with any aftermarket part, confirm the part number lines up with your bike before you open the drain plug.

Best for: the DIY rider who wants near-OEM quality at a friendlier price.

3. Hiflofiltro HF163 — Best Budget-Friendly Option

The Hiflofiltro HF163 is the filter I recommend to friends who change their own oil often and want to keep costs down. Hiflofiltro is one of the best-known motorcycle-specific filter brands, and their catalog covers an enormous range of bikes. Expect to pay around $8 to $12.

What stands out

Hiflofiltro uses a high-quality filter media designed specifically for motorcycles, where oil is shared with the transmission and clutch on many bikes. The R1150RT has a separate transmission, but the brand’s focus on bike use still gives me confidence. It’s widely available online and in many powersports shops.

I like that it’s often sold in multi-packs, which is handy if you do annual or semiannual services. The pricing makes it easy to change the filter every time rather than stretching intervals.

Drawbacks

Fit is generally good, but I always compare it side by side with the old filter during installation. If something looks off, I stop and double-check. It’s a small step that avoids big headaches.

Best for: budget-minded riders who still want a reputable motorcycle-specific brand.

4. K&N KN-163 — Best for Riders Who Like Convenience

The K&N KN-163 rounds out my list. K&N is a familiar name to many riders thanks to its air filters, and its oil filters are well regarded for consistent quality. Pricing usually lands between $12 and $18.

Why I like it

I like K&N for its availability. You can find it at big-box retailers, online shops and many local dealers, which is a real advantage on a long tour. The branding is clear and the part numbering is easy to cross-reference.

The filtration quality is dependable, and I’ve found the fit is reliable. If you already buy K&N parts, it can be convenient to keep everything under one brand.

Things to keep in mind

It costs a bit more than the Hiflofiltro and doesn’t offer a dramatic advantage over the Mahle. I treat it as a solid alternate rather than my first choice. If it’s the one on the shelf and you need it today, don’t hesitate.

Best for: riders who want an easy-to-find, trusted brand name on a road trip.

Quick Comparison

Here’s how I’d sum up the four at a glance:

• BMW Genuine 11 42 7 673 541: best overall, with perfect fit and the highest price.
• Mahle OC 306: best value, with OEM-grade quality at a lower cost.
• Hiflofiltro HF163: best budget pick, great for frequent servicing.
• K&N KN-163: best for availability and convenience.

Choosing the Right Oil to Go With Your Filter

A great filter deserves great oil. The R1150RT is happiest on a quality 15W-50 or 20W-50 motorcycle oil that meets BMW’s specification. If you’re debating mineral versus synthetic, I broke down the options in my guide to the best synthetic oil for bmw motorcycle models.

Riders with older boxers will also find my notes on the best oil for bmw airhead motorcycle engines useful. The needs differ from oilheads, but the reasoning is worth a read.

Oil basics for four-strokes

If you want to understand viscosity, additives and certifications more broadly, I’d start with this guide to the best motor oil for 4 stroke motorcycle riders. My article on the top engine oil for 4 stroke motorcycle use goes a step further with specific picks.

And if you also own a newer BMW, such as a single-cylinder or parallel twin, my write-up on the best recommended oil for motorcycle bmw f700 gs covers that platform.

How I Change the Filter on My R1150RT

You don’t need to be a master mechanic to do this job. It takes me about 45 minutes, including warming the engine and cleaning up. Here’s my routine.

Step-by-step overview

1. Warm the engine for a few minutes, then place the bike on its center stand on level ground.
2. Put a drain pan under the sump and remove the drain plug.
3. Remove the filter cover on the front of the engine and pull out the old cartridge.
4. Wipe the housing clean and inspect it for debris or metal flecks.
5. Fit a new O-ring on the cover, lightly lubricated with fresh oil.
6. Install the new filter, refit the cover and tighten to the torque in your service manual.
7. Refit the drain plug with a new washer, then refill with the recommended oil.

After refilling, I run the engine briefly, check for leaks, and then recheck the level on the sight glass. Take your time at the sight glass, since the level reads best when the bike is upright and the engine has rested for a minute or two.

Mistakes I’ve seen (and made)

The classic error is overtightening the cover bolts, which can warp the cover or damage the threads. Another is reusing a flattened O-ring because it “looked fine.” Never reuse an old O-ring. It costs pennies compared with the cost of a leak.

Also, don’t forget to prime the housing area with a little fresh oil before reassembly. It helps the engine get oil pressure faster on the first start.

When to Change the Filter

My rule is simple: new filter every oil change. For most R1150RT owners, that’s about every 6,000 miles or once a year. If I do lots of short rides, ride in dusty conditions or tour in extreme heat, I shorten the interval.

Oil is cheap insurance for a bike that can easily run past 100,000 miles. Skimping on the filter to save a few dollars never makes sense to me.

My Final Verdict

If you want one answer, I’d go with the BMW Genuine 11 42 7 673 541 for guaranteed fit and peace of mind. It’s the benchmark the others get measured against.

If I’m buying in bulk or just trying to be sensible with my budget, the Mahle OC 306 is my regular pick. The Hiflofiltro HF163 and K&N KN-163 are both perfectly good choices when price or convenience takes priority.

Whatever you pick, pair it with fresh, quality oil, a new O-ring and a careful install. Do that, and your R1150RT will keep running smoothly for many more miles.

Frequently Asked Questions