Do you add it to your car, even if your oil is currently full?

You add it in substitution to oil making sure you don't overfill, right to the upper fill line is perfect & a little over is still ok.

do i need to flush this after leak is fix?

No don't flush. It will come out when you need an oil change.but it would have done its job on that leak..

who do i get a hold of for this guarentee?

You have to directly contact the manufacturer, fill out a form, with proof of purchase, and send it back to them within 60 days

will this stop oil leak on a 2005 hyundia santa fe with 3.5l engine?

I actually called the blue Devil company about a minivan with an oil leak. They said " absolutely". It did slow down the leak.

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44168CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal the deal with BlueDevil—drive leak-free, stress-free!

EFFORTLESS APPLICATION - Just pour into engine oil—no mechanic required, perfect for busy pros
SAFE FORMULA NO DAMAGE - Free from harmful petroleum distillates—protects your engine seals
PERMANENT SEAL ZERO HASSLE - Seals rear main leaks permanently—no extra oil changes needed
DRIVE REPAIR SIMULTANEOUSLY - Restores dry, cracked seals as you drive, saving time and money
UNIVERSAL ENGINE COMPATIBILITY - Works flawlessly with gasoline, diesel, synthetic, and conventional oils

BlueDevil 00234 Rear Main Sealer is an 8 oz permanent sealant designed to repair rear main engine seal leaks by restoring dry or cracked seals while driving. Compatible with all gasoline and diesel engines using synthetic or conventional oils, it offers a safe, easy-to-use solution that eliminates the need for additional oil changes.

Specifications

ASIN	B0079JX4JO
Amazon Bestseller	#474,889 in Automotive ( See Top 100 in Automotive ) #2,619 in Oil System Tools
Brand Name	BlueDevil Products
Color	blue
Compatible Material	Plastic
Customer Reviews	4.1 4.1 out of 5 stars (3,343)
Global Trade Identification Number	00891838002348
Included Components	1 x 8oz bottle
Item Dimensions	15.2 x 6.4 x 6.4 cm
Item Form	Liquid
Item Type Name	Rear Main Sealer
Item Weight	8 Ounces
Manufacturer	BlueDevil Products
Material Type	Rubber
Model	00234
Number of Items	1
Part Number	00234
Style Name	Compact
UPC	891838002348
Unit Count	8.0 Ounce
Water Resistance Level	Waterproof

Reviews

D**E

I used this 2 times now the leak never came back. The first time I used it I was really sceptical about this product still leaking for two days but as I drive along the leak suddenly disappeared. So when I did my oil change I pour another bottle no more leak up to now. I think it does its job kudos to the seller and kudos to bluedevil.

14.08.2022

L**W

worked as described

28.06.2025

T**R

rear seal stopped leaking

7.04.2026

A**Y

Money wasting and very dangerous for turbo cars

28.03.2026

G**X

Good product

7.02.2026

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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