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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⚙️ Shift into the future of smooth driving—don’t let your transmission miss out!

SEAMLESS GEAR TRANSITIONS - Experience flawless shifting with advanced friction modifiers that eliminate slip.
TRUSTED LUCAS OIL QUALITY - Backed by a leading brand known for premium automotive additives and reliability.
WHISPER QUIET PERFORMANCE - Cut down transmission noise and shudder for a smoother, more refined drive.
UNIVERSAL ATF COMPATIBILITY - Works perfectly with all automatic transmission fluids—synthetic or conventional.
PROLONGS TRANSMISSION HEALTH - Formulated to extend the life of your transmission fluid, saving you costly repairs.

Lucas Oil 10441 ATF Conditioner is a 591ml additive designed to improve automatic transmission performance by preventing slipping, reducing noise and shudder, and extending the life of all types of ATF fluids, both synthetic and conventional.

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Manufacturer	Lucas Oil
Brand	Lucas Oil
Model	10441
Product Dimensions	18.11 x 9.53 x 5.41 cm; 249.02 g
Item model number	10441
Manufacturer part number	LUCA10441
OEM Part Number	10441
Item Weight	249 g

Lucas Oil 10441 ATF Conditioner-591ml

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