Head Gasket Sealer Comparison
Thermalweld vs. BlueDevil Head Gasket Sealer
BlueDevil is sold at AutoZone, Walmart and Amazon. If you are choosing a head gasket sealer, here is how the two compare, using each company's own published information.
| Thermalweld | BlueDevil | |
|---|---|---|
| Price | $109 to $275 by engine. Gas 4, 6 and 8 cylinder: $129 | $69.99 for 32 oz |
| Treatments per bottle | Two per 16 oz bottle | One per bottle |
| Better Business Bureau | A+, accredited since 2002 | See BlueDevil's BBB profile |
| Public reviews | 69 of 69 five star, our field repair service, 2013 to 2026 | See BlueDevil's reviews |
| Before you buy | A 60 second online qualifier, and the chemist or the technician on the phone | Retail shelf purchase |
| Made by | Formulated by chemist Robert Hooper, 1995 | See BlueDevil's site |
Better Business Bureau, accredited since 2002. And 69 of 69 public reviews of our field repair service are five stars, 2013 to 2026, on Google and Yelp.
How to choose
Check the company behind the bottle
Every sealer on the market has buyers who swear by it. Before you spend money on any of them, look at four things: how long the company has been around, its BBB rating, its public reviews, and whether a real person will tell you if your engine qualifies before you buy. Thermalweld has answered those the same way since 1995: BBB A+ since 2002, 69 of 69 five star reviews, and a chemist and a technician on the phone.
A 60-second check before you spend anything. Check Now