Oil Change – More than You Probably Ever Wanted to Know
Most Harley Davidson motorcycles on the road today use multi-grade oil — one that can work efficiently in cold and hot weather. A multi-grade oil is rated by two numbers, such as 20-50.
About the oil classification system.
Each engine oil comes with a classification indicating its viscosity, which is its friction or resistance to flow. In a multi-grade oil, the first number indicates how the oil will flow when it is cold. The lower the number, the lighter the oil and the better it will perform at lower temperatures.
Why viscosity is a concern.
During cold starting, only a small amount of oil is present in the upper parts of engines. To lessen the friction when upper engine parts, such as the valve train, pistons, overhead cam and cam bearings, scrub against each other, a lower viscosity allows the oil to reach the components more quickly.
Why 20-50 oils are so popular.
Many Harley Davidson motorcycles today leave the factory with 20-50 engine oil. Manufacturers recommend them because they are lighter oils that perform well in a range of temperatures and help improve gas mileage.
Not all motor engine oils are 100% petroleum. Synthetic oils, which are primarily chemically compounded lubricants, are also available. They can provide:
- Higher viscosity stability over a wider temperature range
- Reduced oil thickening
- Reduced wear and increased load-carrying ability.
Which oil is right for your Harley Davidson motorcycle?
The simplest and safest way to find out is to check your owner’s manual…or talk to your Top Dead Center mechanic.
Oil filters are designed to trap foreign particles suspended in the oil and prevent them from getting to the engine bearings and other parts.
Your vehicle relies on a variety of fluids to operate its brake, steering, transmission, engine cooling and other systems. When these fluids become degraded or are at incorrect levels, damage to other components may occur…so always follow the manufacturer-recommended service schedule.
Automatic Transmission Fluid
This is typically an oil-based fluid used in a transmission that lubricates and cools the transmission and provides hydraulic pressure to shift gears automatically.
This is the hydraulic fluid used to transmit pressure through the brake lines in a brake system providing stopping power and protecting hydraulic brake components from internal corrosion.
This is the mixture of water and antifreeze used in an engine cooling system to dissipate heat and maintain the engine’s temperature throughout its operating range.
Starting & Charging
The battery starts your motorcycle, powers onboard computers, and supplies emergency power needs. A weakened battery causes stress on alternators and starters, especially during extreme temperatures. Let Top Dead Center test and inspect your battery regularly.
Clean air filters can increase engine performance, boost fuel mileage and reduce engine wear.
Top Dead Center Performance Check
The Top Dead Center Performance Check is fast, efficient and covers many items on your vehicle’s preventive maintenance schedule. We’ll conduct a visual check, looking inside, outside, and all around your bike, then provide you with a report of our findings.