Twin Power 20W50 Premium Oil - Gallon (539008)
The Mechanic’s Choice for Air-Cooled V-Twins
Look, we all know oil is the blood of your bike. But if you are running a hot, air-cooled V-Twin (especially an older Evo or a built Twin Cam), that cheap car oil from the auto parts store is just asking for trouble. You need a 20W50 that actually sticks to the metal when your engine temps hit three digits.This is the Twin Power Premium 20W50 (Part #539008) . It comes in a full gallon jug (128oz) , which is exactly what you need for most Big Twins if you are doing a filter change.Twin Power has been behind the counter at every real indie shop for decades. Why? Because it works. It has the high-zinc formula that flat-tappet cams need to survive, without burning off like cheap conventional oil.Why a Full Gallon?
If you own a Softail, Dyna, or Touring bike, you know the frustration of buying four single quarts and having a few ounces left over. You always spill it. With the gallon jug, you pour exactly what you need, seal it up, and save the rest for the primary or the next change.Features & Benefits
- High-Zinc/Phosphorus Formula (ZDDP): This is the important part. Modern automotive oils have reduced zinc because it clogs catalytic converters. Your classic or performance V-Twin needs that zinc to protect the camshaft and lifters. This has it in the correct levels.
- 20W50 Viscosity: Perfect for hot climates and air-cooled engines. It stays thick enough to maintain oil pressure when you are stuck in traffic but flows easily on a cold morning start.
- Resists Thermal Breakdown: Twin Power uses a premium base stock that doesn't turn into sludge after a few hundred miles of hard riding.
- Gallon Size: Economical compared to buying 4 individual quarts. Less plastic waste in your garage.
What Fits?
Strictly speaking: This oil is designed for 4-stroke V-Twin engines (Harley-Davidson, S&S, Ultima, and custom builds) that specifically call for 20W50 in the engine sump.Warning: Do not use this in the primary chaincase if you have a wet clutch that requires specialized Formula+ or ATF unless your manual says so. This is strictly for the engine oil tank/pan.FAQ
My bike is liquid cooled (like a V-Rod or a Buell 1125). Can I use this?
You can, but honestly, a lighter weight synthetic 10W40 or 20W50 synthetic is usually better for liquid-cooled bikes due to tighter tolerances. This is a premium conventional oil, best for air-cooled motors.I have a built 124" engine with high lift cams. Is this oil enough?
For break-in, yes. For high-horsepower street bikes, Twin Power makes a "Full Synthetic" and a "Race" oil. This "Premium" is excellent for stock to mild performance (up to 100hp). It has the zinc, but the synthetic handles extreme heat better.Does the gallon come with a spout or a measuring window?
It comes as a standard jug with a screw cap. Grab a cheap funnel with measurements from the hardware store—it makes filling your oil bag mess-free.Is this the same as the old "+4" oil?
Not exactly. This is their standard premium 20W50. The "+4" is a specific viscosity rating for newer touring bikes. Check your manual. Most 80s, 90s, and early 2000s bikes love this specific part number.Related products
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