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Tag Archive for: milwaukee-eight

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Is A Longer Oil Filter Needed For Harley Milwaukee-Eight Engines?

Tech Discussion

AMSOIL Ea Motorcycle Oil Filters A reader asks: Did you hear that Harley-Davidson has a new oil filter for Milwaukee-8 engines? Apparently, it’s 1/2” longer than the previous oil filter. Is AMSOIL going to spec a longer oil filter for the Milwaukee-8 engine? Or is it even necessary?

Our answer: AMSOIL is not changing their oil filter recommendations for the Milwaukee-Eight motor. They will continue to offer the EAOM134 (black finish) and EAOM134C (chrome). These are the same filters used for the previous generation of Twin-Cam engines.

Why Did Harley Release A Longer Oil Filter For The Milwaukee-Eight Motor?

Harley-Davidson did not make this change to cure an underlying problem with their previous oil filter. It seems to be simply an effort to optimize engine protection.

Harley only offers one reason in the service bulletin announcing this new oil filter. Quote: “The increased media supports the higher flow rate of MKE-8 engines”. This doesn’t imply that the new oil filter offers more flow. They are simply saying that there is a bit more filter media surface area to accommodate the increased volume of oil flow. The Harley-Davidson bulletin also states that using the previous, shorter oil filter will not void warranty.

A longer oil filter does NOT increase the flow rate. It only increases the capacity. The filter media determines the flow rate, not the oil filter size. For example, the entire line of AMSOIL motorcycle oil filters have the same flow rate, regardless of size.

Larger oil filters tend not to translate into any sort of advantage. Consider the size of an oil filter on the average V-6 car engine. Some aren’t much bigger than a motorcycle oil filter. Yet a capacity issue is all but unheard of.

The bottom line is that the quality of the filter media is the most important factor in oil filter performance.

Related: See All Of Our Harley-Davidson/Synthetic Oil Articles

AMSOIL Oil Filters Are Ideal For The Milwaukee-8 Engine

AMSOIL has determined that the size and capacity of the EAOM134 and EAOM134C is more than appropriate for the Milwaukee-Eight engine.

The vital advantages offered by the AMSOIL Ea synthetic filter media are the filtration efficiency rate and exceptionally long service life. They are made to stay in service as long as AMSOIL V-Twin Synthetic 20W-50. This is 20,000 miles or one year. Therefore, capacity and service interval duration are definitely not a shortcoming with the EAOM134 and EAOM134C units. They are constructed with top-shelf components and materials. These filters are definitely built to go the distance.

AMSOIL EAOM Oil Filters also deliver world-class particle removal. They remove 98.7% of contaminants at 20-microns or larger. See how this compares to Harley Davidson’s 5-micron oil filter claims.

Will The Milwaukee-Eight Engine Run Cooler With A Slightly Longer Oil Filter?

Not likely to any measurable degree. Using AMSOIL V-Twin Synthetic 20W-50 can lower V-Twin engine temps. Our customers observe this regularly.

In conclusion, AMSOIL Synthetic Oil Filters for the Milwaukee-Eight engine provide the proper flow rate and more than enough filtering capacity. The AMSOIL EAOM134 and EAOM134C oil filters are very much an upgrade for the M-8 engine. The AMSOIL synthetic filter media is among the most sophisticated on the market. It provides exceptional protection and long service life.

March 17, 2020/by Marc Roden

When To Switch To Synthetic Oil In Harley-Davidson Milwaukee-Eight Engine?

AMSOIL Product Applications, Tech Discussion

A reader asks: I have a 2017 Harley-Davidson Street Glide Special with the new 107 Milwaukee-Eight engine. When is it safe to switch to AMSOIL synthetic oil in this engine? How often should I change the oil after the break-in period?

Harley-Davidson Milwaukee-Eight Engine

The 2017 Harley-Davidson Milwaukee-Eight 107ci motorcycle (photo credit: cycleworld.com)

Our answer: Harley-Davidson suggests changing the oil in Milwaukee-Eight engine after the first 1000 miles from new and then every 5000 miles thereafter. But when should one change to a synthetic oil for the first time? We submit that you can safely switch to synthetic after the 1000-mile break-in period. The piston rings will seat properly and there will be no oil consumption issues going forward. Some customers will do two short intervals of approximately 750 miles with conventional oil. Then they will permanently switch to synthetic oil.

Related: Compilation Of Harley-Davidson/Synthetic Oil Articles 

Once the engine is broken-in, you can safely double Harley’s 5000-mile oil change recommendation with AMSOIL Synthetic 20W-50 V-Twin Motorcycle Oil. AMSOIL’s EAOM-134C oil filter is also designed to match the Synthetic V-Twin 20W-50’s long service interval capabilities.

AMSOIL Synthetic 20W-50 V-Twin Motorcycle Oil20W-50 V-Twin Motorcycle Oil offers unparalleled performance and wear control for your Milwaukee-Eight motor. It can also be used with confidence in the primary chaincase and transmission. If you prefer dedicated fluids for the primary and transmission, check out AMSOIL Synthetic V-Twin Primary Oil and AMSOIL  Synthetic V-Twin Transmission Oil. Regardless of which AMSOIL option you choose, expect cool, smooth operation and optimized shifting.

The AMSOIL EAOM134C oil filter features stout construction and world-class wear particle removal. The long mileage capability and superb engine protection makes this unit a great value for the new Harley Milwaukee-Eight engine.

One of the most convenient aspects of the AMSOIL V-Twin Oils and Oil Filters is that they are ideal for low- and high-mileage Harley owners. Low-mileage riders can easily go the season on one oil change. Ultra-high-mileage riders don’t have to stress about the need to change oil partway through long trips.

Regardless of the oil change interval you settle upon, we recommend changing all fluids in the Milwaukee-Eight engine before winter storage.

April 15, 2017/by Marc Roden

Which AMSOIL Oil And Filter For New Harley-Davidson Milwaukee-Eight?

AMSOIL Product Applications, Tech Discussion
Harley-Davidson Milwaukee-Eight Engine

The 2017 Harley-Davidson Milwaukee-Eight 107ci motorcycle engine (photo credit: cycleworld.com).

Harley Davidson is offering a brand new V-Twin engine for the 2017 model year. The “Milwaukee-Eight” is just the eighth big twin engine design in Harley’s 114 years of existence. This new engine replaces the “Twin-Cam” engine that has been in service since 1999.

Related: See All Of Our Articles About Harley-Davidson Motorcycles And Synthetic Oil 

Correct AMSOIL Oil And Filter For Harley-Davidson Milwaukee-Eight Engines

These recommendations apply to all versions of the 107ci and 114ci Milwaukee-Eight engine.

Update- Spring 2020– AMSOIL Now Offers Synthetic Engine Oil Change Kits For Harley-Davidson Milwaukee-Eight Engines

Engine Oil- AMSOIL Synthetic 20W-50 V-Twin Motorcycle Oil is a legendary performer in Harley V-Twin engines and the Milwaukee-Eight will be no exception. Benefits include:

  • Cooler running temps
  • Strong resistance to thinning and shear down
  • Reduced oil consumption
  • Reduced friction for optimum power output
  • Capable of extended oil change intervals
  • Designed to resist rust and corrosion during winter storage
  • Highly capable for use in engine, transmission and primary chaincase

There is no better way to provide long-term protection for your Harley-Davidson engine.

Oil Filters- We offer two oil filter options that fit both the 107 and 114 Milwaukee-Eight engine.

  • AMSOIL EAOM134C- rich chrome finish
  • AMSOIL EAOM134- gloss black finish

These V-Twin oil filters feature strong construction, high-capacity and the ability to remove fine particles. The synthetic filter media removes 98.7% of particles at 20 microns (which is pretty darn fine!). This further helps with maximizing engine life. The high-capacity media holds contaminants over long intervals. You can depend on the heavy-duty construction of these filters to provide steady service over long journeys.

Correct Oil For Milwaukee-Eight Transmission and Primary Chaincase

Transmission Fluid- There are two options for the Milwaukee-Eight transmission.

  • AMSOIL V-Twin Synthetic Transmission Oil
  • AMSOIL Synthetic 20W-50 V-Twin Motorcycle Oil

Flip a coin between these two. The viscosities are similar and both provide outstanding gear protection and improved shifting. The V-Twin Synthetic Transmission Oil is specially formulated for those that prefer a dedicated transmission oil. The 20W-50 V-Twin Motorcycle Oil is designed to provide top-shelf gear protection and shifting. It has an advantage in terms of convenience and as you use the same product in all three holes.

Primary Chaincase Fluid- Again, two choices.

  • AMSOIL V-Twin Synthetic Primary Chaincase Oil
  • AMSOIL Synthetic 20W-50 V-Twin Motorcycle Oil

Both are proven performers. Choose the dedicated primary fluid or the convenient V-Twin 20W-50. Either product will keep your chaincase safe and sound for many, many seasons.

Oil Capacity For Milwaukee-Eight 107 Engine, Transmission and Primary

  • Twin-Cooled Head Engine- 5.0 qt. (4.7L)
  • Oil/Air-Cooled Head Engine- 5.2 qt. (4.9L)
  • Transmission- 32 oz. (0.95L)
  • Primary Chaincase- 34 oz. (1.0L)

What Is Different About The New Milwaukee-Eight Engine?

  • Available in three formats. 107ci (oil-cooled heads), 107ci (liquid-cooled heads), 114ci (liquid-cooled heads)
  • Now has 4 valves per cylinder
  • Two spark plugs per head
  • Now has a single camshaft
  • Redesigned primary chaincase
  • Heat is managed by cooler combustion and larger cooling fins
  • Engines have slimmer profile.
  • Engines are counterbalanced and rubber-mounted to remove some (but not all) vibration
  • New alternator system delivers a 50% charging capacity improvement
  • Idle has been lowered from 1000 rpm (on Twin-Cam models) to 850 rpm

Improvements Of The New Milwaukee-Eight Over Twin-Cam Engines

  • Runs cooler
  • Run smoother with less vibration
  • 10% more torque. Has a two to three bike-length advantage over Twin-Cam models across the power band
  • More fuel efficient
  • Puts out less emissions
  • Less maintenance required (no valve adjustment needed)
  • Improved charging capacity allows for more accessories

How Does the New Milwaukee-Eight Engine Sound?

While Harley-Davidson took away some of the vibration by way of counter-balancing and rubber-mounting, they were sure to leave a deep exhaust note. The Milwaukee-Eight may be more refined, but it still sounds like a boss. Here is a sound file of the exhaust note from the good people at Cycle World.
Harley-Davidson Milwaukee-Eight Big Twin by cycleworld

December 3, 2016/by Marc Roden

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