is it for diesel? where does it say that?

Yes, this product is safe and compatible with both gasoline and diesel engines.

will this help worn valve seals ?

According to my mechanic this was the same problem I had with My daughters car. It used to smoke when you first turn on in the morning and after using it the way instructions say the car no longer smokes

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Stop Smoke & Engine Repair – 16 oz | Reduces Exhaust Smoke & Restores Engine Compression | Works While You Drive

Product ID: 239239018

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💨Reduces exhaust smoke by up to 90%

🔧Reconditions seals & rings on the go

⚙️Restores engine compression for peak performance

Description

🚗💨 Stop Smoke, Start Power: Drive Cleaner, Drive Stronger!

SEAL THE DEAL - Softens and expands worn seals and piston rings—no engine teardown required.
SIMPLE ADD GO - Just pour into your oil and hit the road—maintenance made effortless.
UNIVERSAL ENGINE ALLY - Safe for all engines—gas, diesel, synthetic, or conventional oils.
BREATHE EASY DRIVE CLEAN - Minimizes blue & white smoke for a cleaner ride and greener footprint.
POWER UP WITHOUT THE PIT STOP - Restores engine compression to boost fuel efficiency and horsepower while you drive.

BlueDevil Stop Smoke & Engine Repair is a 16 oz powerful additive designed to reduce exhaust smoke by minimizing oil burning, restore lost engine compression, and recondition worn seals and piston rings—all while you drive. Compatible with all engine types and oil formulations, it offers an easy, no-disassembly solution to improve engine performance and fuel efficiency.

Specifications

Manufacturer	BlueDevil Products
Brand	BlueDevil Products
Model	BlueDevil 00243 Stop Smoke & Engine Repair - 16 Oz.
Item Weight	1 pounds
Product Dimensions	3.63 x 1.75 x 7.5 inches
Item model number	00243
Manufacturer Part Number	00243

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