Do you have to flush the transmission to use this,or can l just add this to existing transmission fluid, thanks for the feedback

After 50,000 miles you should change your transmission fluid (and filter unless it's a screen type) if it's still bright red. But If it's very dark red or even worse black then flush the transmission it's money well spent to save your transmission. Keep in mind it will look like red metallic paint that's just part of normal wear. If it's bright red then just drain some transmission fluid to keep it at the proper level. Overfilling an automatic transmission by just a few ounces can cause it to leak. Best of luck to you.

Does this work on a Prius?

I believe it works on any automatic transmission. Call Lucas Oil company to make sure and/or Toyota

he can use on any transmission fluid?

Yes it's compatible with conventional and full synthetic transmission fluids note that this product is not compatible with CVT fluid

do you have to drain any fluid

Check your fluid levels first, always! If it's full, or close, then drain the appropriate amount. 32oz bottle, drain 32ozs. Keep the old fluid just in case if you do a drain & fill on a trans that hasn't been serviced for 10+ years or over 30k-50k miles. That fluid may contain clutch material that's allowing everything to work properly, and fresh fluids can disrupt the fine fluid friction balance needed for an Auto Trans to work correctly.

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Lucas Oil 10441 Automatic Transmission Fluid Conditioner - 20 Ounce

Lucas Oil 10441 Automatic Transmission Fluid Conditioner - 20 Ounce

Product ID: 8217077

Details

Brand
Lucas Oil
Item Weight
8.78 ounces
Liquid Volume
1 Fluid Ounces
Material
Plastic
Package Information
Bottle

🔇Reduces noise & shudder

⚙️Improves shifting precision

🛢️Compatible with all ATF types

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Description

⚙️ Shift smoother, drive smarter — don’t let your transmission fall behind!

SMOOTH SHIFTS EVERY TIME - Transforms sluggish gear changes into crisp, confident shifts for a premium driving experience.
REVIVE AGING TRANSMISSIONS - Reconditions seals and friction discs to restore near-new performance, even in high-mileage vehicles.
WHISPER QUIET TRANSMISSION - Dramatically cuts down annoying transmission noise and shudder, elevating your ride’s refinement.
UNIVERSAL ATF COMPATIBILITY - Works seamlessly with both conventional and synthetic automatic transmission fluids—no guesswork needed.
TRUSTED BY PROS ENTHUSIASTS - Backed by ASE-certified mechanics and thousands of glowing reviews—join the savvy drivers who refuse to settle.

Lucas Oil 10441 Automatic Transmission Fluid Conditioner is a 20-ounce additive designed to improve shifting quality, reduce transmission noise and shudder, and restore performance in both new and older automatic transmissions. Compatible with all types of ATF fluids, it reconditions seals and friction discs to extend transmission life and enhance driving smoothness. Ideal for proactive maintenance, this trusted formula is highly rated by professionals and enthusiasts alike.

Specifications

ASIN	B003JU71YG
Best Sellers Rank	#25,928 in Automotive ( See Top 100 in Automotive ) #79 in Transmission Fluids
Brand Name	Lucas Oil
Container Type	Bottle
Customer Reviews	4.7 4.7 out of 5 stars (1,268)
Global Trade Identification Number	00049807104412
Included Components	Lucas Oil 10441 Automatic Transmission Fluid Conditioner - 20 Ounce
Item Form	Oil
Item Type Name	Lucas Oil 10441 Automatic Transmission Fluid Conditioner - 20 Ounce
Item Weight	8.78 ounces
Liquid Volume	1 Fluid Ounces
Manufacturer	Lucas Oil
Material	Plastic
Model Number	10441
Number of Items	1
Part Number	LUCA10441
Recommended Uses For Product	Automotive
Specific Uses For Product	Transmission maintenance and repair
UPC	049807104412 049807804411
Unit Count	20.0 Fluid Ounces
Warranty Description	Warranty

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

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