Nulon Permanent Head Gasket Repair

I have a 2001 Subaru forester. Small head gasket crack passenger side (Australian model) approx 6 years ago. Was quoted $3200 to repair- tried Nulon, 100,000km sometimes in 40*C heat, needs a top up now and then but good old Sally refuses to die. I’m mechanically illiterate, maybe it works different in different engines but I’ve had success

100% recommend – Car would take 15mins to start each morning, rough idol, white smoke, losing coolant. Gave Nulon a shot. Followed instructions and the next morning started first time! No rough idol, my radiator levels were normal for the first time in a long time, and it gained a little bit of power. I think if it’s a really bad head gasket problem it probably wouldn’t work, but I highly recommend trying it. Show details

Waste of money – Followed the instructions, flushed the cooling system. Poured in the Nulon, filled up the radiator, started and ran for 15 minutes. Zero impact. A complete waste of money. Show details

Absolutely disappointing – Didn't work at all very disappointing was very hesitant to buy wish i followed my gut feeling and didnt waste my money Show details

Would recommend – I used it on my diesel 4 cylinder Stoped bubble And overheating pressure stopped. Show details

Absolutely works – I have a 2006 Hyundai Getz. I had 2 cylinders getting water into the spark plugs and running rough. I put nulon permanent head gasket repair into radiator, per the instructions. Started purring like a kitten straight away. 3 weeks later I drove from The Entrance NSW to Perth WA ,over 4000km. I took a week to drive there. I left on the 15th of… Read more

December 2022, so in Summer. Made it to Perth without a problem. Never used oil or water. 3 months later the little Getz is going great and is registered in WA. So I absolutely recommend this product.

It actually worked – Head gasket leaking coolant into cylinder. Rough start and initial idle. Put in new radiator and hoses. Added head gasket repair and let run for 10 minutes. Started perfectly. It even has auto choke which never worked before. Only 67000ks so was worth taking a gamble on this. Its probably been 6 weeks and 400ks since i used it. Show details

This stuff is AMAZING! – Started rough, water dripping from exhaust, white smoke,=. Quoted $2500 - $4000 to diagnose/repair cylinder head gasket/head leak by mechanic. Then told not to use this stuff, but to flush out the radiator, distilled water, copper based product blah blah. Took a punt on this Head Gasket Repair from Nulon. Followed the instructions and the vehicle starts a dream, no water, no smoke. Thanks NULON!

Works excellent – Water in oil and water under oil cap. Assume head gasket crack/corrosion to cylinder head. Worked a treat.. Well Worth using this. Good patchup in my mind to extended life/use until want to repair properly. Very pleased Show details

Definitely worth a try – Used on mate's 2010 Hi-Ace Toyota van, 2.4L petrol/lpg, running very rough and misfiring low power with strong red coolant stain on two spark plugs and water running from exhaust, gave it new plugs and the Nulon HGR and within 2 minutes at idle the stream stopped, still a little rough with an excess of vapour, after 10 minutes vapour ceased, all… Read more

signs of leak disappeared, idled smoothly, runs powerfully, has since been on long trips in hot weather with AC and fully loaded. New plugs were important to ensure ignition and heating of the bad cylinders to set the sealant. Couldn't be happier.

Crapy – Worst waist of money ever. I followed the instructions and it did less than nothing. Apparently my fault nulon said like idk how to poor a bottle in the radiator

works on my wrx ej255 – !! Update to the review below !! The seal worked only for one month. It is totally waste of money. DO NOT BUY !! Engine overheating. replaced the leaking radiator, new thermostats, and the faulty radiator caps (my car has 2). The car still overheated and I found that I was losing coolant. I did the headgasket leak test and confirmed there was… Read more

a small headgasket leak. Well, it was big enough to cause problem.

I was thinking if I shoud sell or pull the engine to rebuild and I came across this product. Did a lot of research, seemed worth the shot.

I put it on as per instructions. Car ran well not losing coolant but still water temp went a bit funny. Took a while to get all bubbles out and the car now runs like new for 2 months.

Will report back if thing goes wrong.

To be fair, this product supposed to fix a minor head gasket failure. Not fixing all overheating problems.

It hasn't worked – Used the recommended coolent, changed the oil before adding it, flushed and bled the radiator before adding it, ran the engine for the recommended time with heaters on full blast. No change, still overheating. Show details

This product works for us – This product works for us we were told the best thing we could do what’s the scrap the car as it would cost us $3000 to fix the head pretty devastating, bought this product followed instructions got the car going it saved the day for me Show details

Awesome – Ok. So had problems with car (vt commodore) over heating and idling roughly even after replacing spark plugs and flushing radiator. After googling solutions found this stuff online and after using, have had immediate improvement. No rough idling or over heating. No white smoke or water coming out of exhaust. Radiators holding coolant 100 %, where… Read more

as before, I was topping it up every day. Through My impressed. Best 50 bucks I ever spent. Thanks Nylon.

Awesome! – Ford Falcon EL 6 cyl.. blown head gasket and running like a steam engine until taking the chance and adding this product. After adding per instructions, next day went for a test drive and it was still a cop magnet, steam out of exhaust and missing badly as if on 5 cylinders. After about 2kms it smoothed out and noticed idling was perfect, so then… Read more

took it out on a 100kph speed zone. Ran like a sewing machine and next morning noticed dry coolant on head & block under No.1 spark plug. Feel I got lucky that it may have been a hairline fracture in head gasket at front of engine, removed spark plug to confirm. Now it's simply a matter of how long it lasts? I like the word 'permanent', but this is sufficient to keep car running until I can go out and buy someone elses problems. Would highly recommend, if it doesn't work it obviously means the damage is far too extensive, over quoted 0.8mm crack, definitely worth taking a chance given full repair costs.

It actually Works – My EL ford had classic blown head gasket symptoms (loosing coolant, white residue in oil filler cap and rough starting) so after reading hundreds of positive reviews on this product decided to give it a go. Followed all directions and was a bit worried the following day when I started the car and it was still rough to start & idle but it came… Read more ·  2

good quickly and ever since starts and idles perfectly.

Coolant level has not dropped at all in almost 2000 klm and no sign of any moisture under the oil cap. YES it does what it claims.

One important thing is to make sure the cooling system is clean and not clogged up with crap before using it. Use a good quality radiator flush and then flush the system thoroughly in both directions with plenty of water pressure to remove the loosened crap.

Final verdict....Excellent so far.

Total Failure – This item did not last one day. If your car has issues with the head fix it properly and put the money that this junk costs into a proper repair. I tried the cheap way out and knew that I knew better. $38.00 all over the road. Total rubbish Nulon should be ashamed. Tony. Tasmania Australia.

Excellent – My 4x4 was leaking 1L of coolant every 500kms or so & air bubbles in the reservoir. Used this product and 6 months on with over 5000kms (including a 1500km round trip to the Victorian High Country with over 250km low range heavy driving) I haven’t lost one bit of coolant. Very happy customer. Let’s hope it goes on fine for years to come

Incredible – 1993 Pajero I paid $1000 plus registration. I didn't have much money after about 2 months steam started coming out from under the bonnet. From the dipstick (cracked head or gasket) could cost thousands. I followed the instructions to the letter changing coolant and even replacing radiator hoses. Amazing Worked perfectly. I will re post if it all… Read more

goes bad.

April 16th 2018 Update: Blocked radiator and heater cores

It worked great to start with fixed the leaking head gasket no more problems there. But after 10 days no more heater and the engine is over heating. It seems to be getting worse the other day it was getting hot going up hill but now it gets hot on the flat only going 90 kilometres an hour. If you're going to use it drain you system out after and flush refill with clean coolant. Before it's too late.

Fantastic Product - Worked for me ! – I own a 1998 Holden Rodeo (TF) Ute, V6 and done over 300,000Km. The Ute started to use over a litre of coolant per week and quickly got worse. I notice air bubbles coming up in the top Radiator tank and was told I had a blown Head gasket, Cracked Head or Block. As the Ute is only valued at $3,500,a costly repair was out of the question. I search… Read more

Google and found this Nulon Head Gasket Repair product. Not convinced about additives, I had nothing to lose, so bought a bottle. Followed the instructions carefully and to my utter surprise it worked...maybe still early days, but I have not added coolant for 8 days !!