Customer Stories
Real Repairs. Real Savings. Real Words From Real Customers.
Thermagasket has been repairing head gaskets, cracked heads, and blown engine blocks since 2005. Below are unedited stories from customers who used it — on Cadillacs, diesel trucks, Subarus, boats, and everything in between.
Cadillac Northstar Owners
The Northstar engine has one of the worst reputations in the industry for head gasket failure. Here's what actual Northstar owners experienced:
"I can say is WOW. As a former owner of a smog station and auto repair shop for almost 10 years in Sacramento and a car dealer for longer than that I can almost assure you that I was your biggest skeptic. As of right now the thermagasket product is a perfect 4 for 4 including: 96 caddy DeVille Northstar engine, 94 Seville Northstar, 98 Chevy Cavalier and a 96 Mazda Millennia S. The most unbelievable one was the 96 Northstar where water actually poured out of the oil pan (I drained 15 quarts out of the oil pan) and smoked more than a national boy scouts convention learning how to make fire and send up smoke signals but after 15 minutes the car 100% sealed up and now not smoking, overheating, missing and no apparent breach in the system at all."
"I bought a cream puff of a 1998 Cadillac Deville... it overheated... a well known Caddy repair shop in North Atlanta... $3700 to replace the head gaskets, ouch. I started researching and no one seemed to have the true FIX. rxauto.com was the real place... I talked to Dave and got the Northstar kit and FOLLOWED the directions... off on the first drive I went with cell phone in hand. Nothing, no overheating, no stalls, no water leakage. WOW is all I can say... I have seen 3 Cadillacs on the side of the road, overheated, in the last 2 weeks and I stop and tell them, 'RXAUTO.COM.'"
"Your products are awesome. Fantastic results for my 98 Caddy. The thermostat stuck while doing 80 MPH on I-40 and the car overheated. Estimated repair was $3200.00. Your product cost $150 plus $280.00 for the shop to install. Total $430.00. Savings = $2770.00. It has been 5 months and 5000 miles and it is working great."
"My 1997 Cadillac Deville was diagnosed with a blown head gasket in cylinder. Overheated in 15 min. 2 Shops diagnosed the problem, but refused to work on the Northstar Engine. Cadillac wanted a minimum of $5000.00 to replace the head gaskets. After installing the Thermagasket Northstar Kit we have put over 4000 miles (with several trips over 500 continuous miles) with no problem at all."
"Wow!!! The dealer quoted me a repair of $2,400 to replace headgaskets... I followed your directions and the exhaust gasket leak was repaired in about the first 8 minutes. Please feel free to circulate my experience to any of the Subaru owners, as this is a very common problem with the 2.5 L engine."
Diesel & Heavy Duty
"I called last year before Christmas when my 1995 Kenworth with a 460 HP Cummins Turbo overheated and blew a head gasket. I was about 800 miles from home!... You guys next day aired the kit to me... As of August 1st I have clocked 90,000 miles on my truck since the repair without a hint of problems. The engine has about 350,000 miles and is running great. I keep a kit in my truck at all times just in case."
"I have a d466 International diesel truck that had a huge amount of water getting in the oil... I decided to try your product. Well the news is good... it just about quit steaming that first day and after the second treatment the engine has nothing coming out of the blowby tube but a little blowby."
"Just wanted to say it worked in my 85 Ford Diesel, I have been plagued with this head gasket problem for years and in one application your product fixed it."
Mechanics & Repair Shops
"At our shop we see a lot of customers that just can't afford to have a head gasket repair done on their vehicle. Thermagasket gives us an affordable alternative, not to mention we can usually get their car done in less than a day!"
"I have repaired approximately 50 vehicles with ThermaGasket. This product works and works quickly. Being a mobile mechanic and working at the customer's location, I need to be able to get in, get the car repaired, and gone quickly without a lot of hassle and mess. I used to turn down head gasket jobs! But not anymore."
"We bought the Thermagasket and repaired a Pontiac Quad 4 that had water in the oil and quite a bit of water coming from the tailpipe. We then purchased again to repair a Dodge 350 Diesel with a crack in the block... You now have a customer for life!"
Everyday Drivers, Every Make
"I just wanted to say thanks, I recently purchased your product due to a blown head gasket on my 1994 Toyota V6 pickup with 172,250 miles on the odometer. After getting several estimates that would cost more money than the truck is worth, I decided to try your product... the truck did not smoke or overheat and now runs better than ever."
"Faced with a repair bill that outweighed the price of the car, I was prepared to sell the car for scrap... After the treatment arrived I followed the instructions and was truly amazed to see the steam coming from the exhaust disappear!... Now the car is running better than I ever remember it running."
"My son has a 1998 Subaru Outback that overheated three times... the local Subaru dealer discovered a cracked block. We were faced with a ruined car or a $4500 repair bill for a new engine... we now have our Subaru back with a savings of $4400!! What a great product!"
"Faced with the options of replacing the engine with a new $2,800 dollar one, or a used one for $695 plus $500 dollars to install it, I was between a hard and a much harder place... until I read about ThermaGasket... everything they said, my truck is repaired, I was truly amazed."
"Our mechanic gave us the bad news: junk the truck or pop for the $2,800 major engine repairs. Then I ran across Thermagasket on the internet... it's now mid-April and 8,000 miles later. And not a hint of a leak ever since... Your product saved us at least $2,800 in a major engine repair."
Follow-up, months later: "We just sold our 1998 Ford Expedition after driving over 30,000 miles after using Thermagasket with no problems whatsoever, and got $3,700 MORE for it in trade than Kelly or Edmunds suggested we'd get."
"After getting estimates in the $2400 range to repair the blown head gasket on my 97 Lexus LX450 I figured I'd give your product a try and to my absolute amazement... IT WORKED!!! I will recommend your product to everyone I know."
"I have a TATA Utility. These vehicles have a bad reputation for blowing head gaskets... at a cost of approx $4500 including labor... I found Thermagasket on a web search... One treatment and I have done another 25000km with no fluid loss... Thanks for keeping $4400 in my pocket."
These are real customer testimonials, lightly edited only to correct scanning/formatting errors. Individual results vary by vehicle and severity of failure — Thermagasket is backed by a money-back guarantee if we're unable to help with your repair.