Why is this oil rated only for motorcycles? Won't it perform as well as previous Castrol 20-50 synthetics in my bal. and bluprinted auto engine?

It is not for Car engines. It is formulated without certain friction modifiers to keep wet clutches gripping. Oil change intervals for motorcycles are closer together for this reason. Do not use it in your car.

How often do u change synthetic oil. In 2012 Flhtk?

I would stick to the 3000 mile change as called for in the owner's manual. I know some people say you can go longer with synthetic but I would not. Saying that, much of it has to do with if you do a lot of stop and go city driving vs to hwy, in town driving can stress the bike more than hwy. Oil changes are cheap in the big scheme of things, you should always check your oil and alot can be told by the color and smell. Hope this helps, drive safe.

Will this oil work for both a ducati monster dry clutch (m900) and wet clutch (620 dark)? thanks!

The dry clutch doesn't get engine oil so if the engine is recommended for full synthetic there's no problem for the "dry" clutch. As far as the 620 goes if the mfr recommends full synthetic then go with it.

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Castrol Power1 4T 5W-40 Full Synthetic Motorcycle Oil, 1 Quart, Pack of 6

Product ID: 4018424

Details

Brand
Castrol
Liquid Volume
192 Fluid
Package Information
Bottle
UPC
079191215975
Vehicle Service Type
Motorcycle

⚡Race-derived formula boosts acceleration

🔥Trizone tech protects engine, clutch & gearbox

🌡️Extreme temp stability for air & water-cooled engines

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MOP$1146

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Description

🏍️ Unleash peak power with every ride – because your bike deserves the best!

THERMAL MASTERY - Performs flawlessly under extreme high temperatures in both air-cooled and water-cooled engines
RACE PROVEN POWER - Formulated with race-derived tech to maximize engine acceleration and responsiveness
TRIPLE ZONE DEFENSE - Trizone technology shields engine, clutch, and gearbox for ultimate durability
CERTIFIED EXCELLENCE - Exceeds API SL and JASO MA-2 standards for premium synthetic motorcycle oil
SHEAR STABILITY CHAMPION - Maintains viscosity to prevent breakdown, ensuring consistent performance ride after ride

Power1 4T 5W-40 is a premium full synthetic motorcycle oil engineered with advanced Trizone technology to protect the engine, clutch, and gearbox. Designed for extreme temperature resilience and race-derived acceleration, it ensures superior shear stability and exceeds top industry standards (API SL, JASO MA-2), making it the go-to choice for riders demanding maximum performance and reliability.

Specifications

ASIN	B008MISDII
Automotive Fit Type	Universal Fit
Best Sellers Rank	#3,241 in Automotive ( See Top 100 in Automotive ) #56 in Motor Oils
Brand Name	Castrol
Compatible with Vehicle Type	Motorcycle
Container Type	Bottle
Customer Reviews	4.7 4.7 out of 5 stars (1,009)
Global Trade Identification Number	00079191061138, 00079191215975
Included Components	1 Quart, Pack of 6 Motor Oil
Item Type Name	Motor Oil
Item Weight	0.01 Ounces
Liquid Volume	192 Fluid Ounces
Manufacturer	Castrol
Manufacturer Part Number	06113
Manufacturer Warranty Description	12 Months
Model Number	6113
Size	1 Quart
UPC	079191215975 079191064108 079191061138
Unit Count	192.0 Fluid Ounces

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