Head Gasket Sealer for 4 Cylinder Engines -

Coolant was seeping into my cylinders overnight which was causing misfires and check engine lights the morning after. I believe I caught the early stage of gasket failure and coolant reservoir maintained level after using this product. Tip: the instruction said to run highway speeds maintaining 4000rpm, which is not feasible. This can be achieved driving around your neighborhood in low gear and your speed will be slower to 30km/h.

I had a check engine light on with ABS light. Did the usual fixes - changed the fuel cap, reset the codes, etc. As the car was 100k plus miles, so replaced the spark plug. After a while the check engine light came back. The code check was P0304 - cylinder 4 misfire. It was a head gasket leak - bubbles in radiator and smell gas in coolant. Got the hydrocarbon tester from OReily's and it confirmed. I checked the engine oil cap but it didn't have any residue. I also removed a little engine oil to check if coolant had gone into engine. I didn't find any major trace of coolant. However, the coolant was going down and I had to fill up coolant once a week. This is when I decided to try the head gasket sealer. I removed the thermostat, filled the radiator with normal water. Followed the instructions mentioned in the pack. Once I added the sealer, kept engine running for 30mins. After this, I drove the vehicle for 15 - 20 mins on free way at 3000rpm. Left it to cool overnight. I had reset the engine codes and drove the car around. The check engine lights didn't come on. I have been driving the car for more than 3 months now. I had no issues with this - no check engine light, no gas smell in radiator / hydrocarbons. I can only upload one video, hence can't show the video where there are no bubbles.

I used 2 bottles. Others have had success but not me.. Maybe my head gasket is too far gone

Worked for about two hours. Initial start up and drove for a couple of hours and didn’t leak. Second drive about two days after and started leaking antifreeze again. Not a big leak to begin with. A pinhole leak on cylinder head. Used two bottles. Used two bottles on a 4 cylinder, 1800 cc engine.

It didn’t work