Understanding the proper oil capacity and maintenance procedures for the 1340cc Evolution engine is essential for ensuring its long life and performance.
Harley Davidson 1340 Evo Engine Oil Capacity
The Harley-Davidson 1340 Evo engine oil capacity is approximately 3.5 to 4.0 quarts, including the oil filter. Start by adding 3 quarts of 20W-50 oil, then run the engine to operating temperature, shut it off, and check the level using the dipstick while the bike is on the correct stand (upright or sidestand, depending on the model).
Afterward, top off as needed until the oil reaches the full mark. The primary case holds about 1.0 to 1.2 quarts, and the transmission requires approximately 0.75 quarts of gear oil. This process ensures accurate fill levels and avoids overfilling.
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Overview of the 1340 Evo Oil System
The 1340 Evo engine uses a dry-sump oil system. This means it does not store oil in the crankcase, but instead relies on a separate external oil tank. This system is different from many modern engines and requires a specific oil filling and checking process.
The oil system includes three separate compartments:
- Engine oil tank
- Primary drive
- Transmission
Each compartment requires different oil capacities and sometimes different types of oil.
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Best Practice:
- Add 3 quarts of oil initially.
- Start and run the engine until it is warm.
- Shut off and allow it to rest for a few minutes.
- With the bike on the sidestand or upright (depending on the model), check the dipstick.
- Add more oil if needed until the level reaches the full mark.
Primary Drive and Transmission Oil Capacities
While the main focus may be the engine oil, it’s important not to overlook the primary and transmission compartments when servicing the Evo engine.
Primary Case Oil Capacity
The primary drive holds approximately 32 to 38 ounces, which is equal to about 1.0 to 1.2 quarts. It should be filled until the oil reaches the bottom of the clutch hub or clutch basket. The motorcycle should be in an upright position when checking and filling the primary case.
Transmission Oil Capacity
The transmission typically requires 24 ounces, or about 0.75 quarts of gear oil. As with the engine, the bike should be upright when filling and checking the transmission oil level.
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Evo Engine Recommended Oil Type
For most riding conditions, 20W-50 oil is recommended for the 1340 Evo engine. This oil weight performs well in both hot and cool weather and provides excellent lubrication and thermal stability. Riders can use high-quality conventional, semi-synthetic, or fully synthetic oils depending on preference and riding conditions.
Some riders use a single oil, such as Harley-Davidson’s SYN3, for the engine, primary, and transmission. However, others prefer to use specific oils for each compartment for better performance:
- 20W-50 motor oil for the engine
- Primary chaincase lubricant or motor oil for the primary
- 75W-90 or 80W-90 gear oil for the transmission
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Valvoline 4‑Stroke Motorcycle SAE 20W‑50
This conventional (or full‑synthetic variant) motorcycle oil is formulated specifically for 4‑stroke engines with wet-clutch systems. It delivers superior wet‑clutch protection, smooth shifting, high thermal stability, and is backed by excellent wear resistance compared to industry standards.
Royal Purple Max‑Cycle 20W‑50
A high-performance full synthetic oil engineered with Royal Purple’s proprietary Synerlec additive technology, Max‑Cycle offers outstanding film strength, oxidation resistance, and cooler running in air‑cooled V‑twin engines, earning praise from riders using it in Harley‑Davidson models.
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How to Change the Oil in a 1340 Evo Engine
Step 1: Prepare the Motorcycle
Start the motorcycle and allow it to reach full operating temperature. This helps the oil drain more completely. After warming it up, turn off the engine and place the motorcycle securely on a stand or jack.
Step 2: Drain the Engine Oil
Locate the oil tank drain plug or hose. Remove the plug or loosen the clamp and allow the oil to drain completely into a pan. Be careful as the oil will be hot.
Step 3: Replace the Oil Filter
Use an oil filter wrench to remove the old filter. Lubricate the gasket of the new filter with a little oil and install it hand-tight.
Step 4: Refill the Oil Tank
Pour in about 3 quarts of new oil to start. Use a funnel to avoid spills. Do not fill all the way to the top.
Step 5: Warm and Check Levels
Start the engine and let it run for a couple of minutes to circulate the oil. Shut it down and wait a few minutes. Then check the oil level with the dipstick and add oil as necessary to reach the full line.
Step 6: Drain and Fill the Primary
Remove the primary drain plug and let the oil drain out. Replace the plug and fill the primary case with 1.0 to 1.2 quarts of primary fluid or motor oil until it reaches the correct level.
Step 7: Drain and Fill the Transmission
Remove the transmission drain plug, allow the oil to drain, then reinstall the plug. Refill with 0.75 quarts of gear oil through the fill plug. Check the level and top off if necessary.
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Common Mistakes to Avoid
- Overfilling the Engine: Adding too much oil can lead to foaming, leaks, and poor lubrication. Always check the dipstick after warming up.
- Using the Wrong Oil Weight: Stick with 20W-50 or the manufacturer’s recommended oil to ensure proper viscosity and protection.
- Skipping the Warm-Up Step: Checking or draining cold oil can lead to inaccurate measurements or incomplete drainage.
- Incorrect Positioning: Some dipsticks are calibrated for reading while the bike is on the sidestand, while others require the bike to be upright.
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FAQs
What kind of oil does a Harley Evo take?
A Harley-Davidson Evo engine typically uses 20W-50 motor oil, especially in warmer climates. Both conventional and synthetic oils can be used, though many riders prefer synthetic for better high-temperature protection and longevity.
How much oil goes in a Harley engine?
Most Harley-Davidson Big Twin engines, including the 1340 Evo, require about 3.5 to 4.0 quarts of oil with a new filter. Always check the dipstick after warming the engine and topping off as needed.
Can I use 20W50 in Harley Primary?
Yes, you can use 20W-50 motor oil in the primary drive, although Harley recommends using a designated primary chaincase lubricant. Some riders prefer using a dedicated fluid, but 20W-50 is commonly used without issue.
How much engine oil capacity?
The engine oil capacity of the Harley 1340 Evo is 3.5 to 4.0 quarts, including the oil filter. Start with 3 quarts, run the engine, and top off to the full line after checking with the dipstick.
How much oil does a 1340 Evo take?
The 1340 Evo engine takes approximately 3.5 to 4.0 quarts of oil when changing both the oil and the filter. Begin with 3 quarts, then warm the engine and check the level to top off correctly.
Final Thoughts
The 1340 Evo engine remains a reliable and beloved part of Harley-Davidson’s legacy. Proper oil maintenance is crucial to keeping these engines running strong. Always verify your model-specific specifications, but as a general rule, starting with 3 quarts of engine oil and adjusting as needed after warming the bike will help you hit the right level. Combine this with proper service of the primary and transmission, and your Evo will stay on the road for many years to come.
