Do Stop-Leak Products Actually Work?

If you’ve ever had an oil leak in your car, you’ve probably used (or were tempted to use) a stop-leak product. But, do they actually work? Do they cause damage to your engine seals? Will they destroy your engine? Read and watch on to find out.

Todd at Project Farm tested 13 different stop-leak products from AT-205, Lucas, Bardahl, Liqui Moly, Bar’s Leak, Lubegard, Hapco, Blue Devil, XADO, Seal Lube, CD-2, Justice Brothers, and Wynn’s.

Products were compared for their ability to condition or soften hardened rubber engine components, impact on new rubber engine parts, ability to resist evaporation under normal engine operating conditions, and film strength or the ability to lubricate engine components.

The bottom line is that, yes they do work (though some better than others). Todd only recommends using them on older vehicles and recommends repair over stop-leak whenever possible.

The brands that performed best were AT-205 ($20), Seal Lube ($35), Justice Brothers ($22), and Lubegard ($16).


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