How many bottles does it take to flush a four cylinder system?

Based upon my experience, ONE bottle is more than enough.

Is it safe for aluminum radiators? Their website doesn't say.

I have used it in aluminum radiators a lot If the radiator is in bad shape it might leak This is a great product here

What are the disposal instructions on this product?

Just recycle ♻️ at recycling center

Can you use this for boats?

I don't own a "ship" but sure has hell my "boat" has a water to water heat ex-changer that gets strangled by salt and mineral deposits on the lake/sea side, that require a nice acid boil to clean out. The closed loop with coolant in it gets flushed every two years. I would not trust much of what you say about "boats".

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BlueDevil Radiator Flush – 32 oz | Deep Cleaning Coolant System Flush | Remov...

BlueDevil Radiator Flush – 32 oz | Deep Cleaning Coolant System Flush | Remov...

Product ID: 6344511

⏳Extends vehicle life with regular use

🔥Prevents overheating & costly repairs

⚙️Concentrated formula for deep cleaning

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$U2244

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Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Flush the old, fuel the bold! Keep your engine cool and your ride unstoppable.

DEEP CLEAN POWER - Penetrates and removes harmful deposits inside your cooling system for peak efficiency.
OVERHEAT DEFENSE - Helps prevent engine overheating, saving you from unexpected breakdowns and expensive repairs.
BOOSTS PERFORMANCE - Restores coolant flow and system efficiency to keep your engine running smoothly.
CONCENTRATED FORMULA - A little goes a long way—powerful cleaning in every 32 oz bottle.
TRUSTED TOP RANKED - Ranked #2 in Radiator Flushes with a 4.5-star rating from over 500 users—join the savvy drivers who trust BlueDevil.

BlueDevil Radiator Flush is a concentrated 32 oz formula engineered to deep clean your vehicle’s cooling system by removing harmful deposits. It prevents overheating, extends engine life, and improves overall performance, making it a top-rated choice among automotive maintenance products.

Specifications

ASIN	B00BJOT9A8
Best Sellers Rank	#39,285 in Automotive ( See Top 100 in Automotive ) #2 in Radiator Flushes
Brand	BlueDevil Products
Customer Reviews	4.5 4.5 out of 5 stars (517)
Date First Available	February 22, 2013
Item Weight	2.4 pounds
Item model number	00204
Manufacturer	BlueDevil Products
Manufacturer Part Number	00204
Model	00204
Product Dimensions	5 x 2 x 8.5 inches

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