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I have a mustang 6 cylinder and used the Steel Seal Head Gasket Sealer on it to repair the leaking head gasket but it actually clogged my radiator and heater core! Plus it never did seal my head gasket! My mechanic told me it’s going to cost me over 1000.00 dollars to have those parts replaced! I don’t have that money so I’m having to take the bus to work! Those people over there at steel seal customer service never answer the phone. I’ve left messages and no ones ever called me back… That company sucks!
I tried that steel seal on my sons truck and it clogged the heatercore! It never did stop the overheating or the water leak. That stuff sucks.
Do not use Duraseal if you have a turbo diesel engine. I tried it on my 2008 Ford F350 6.4 diesel as a last resort after replacing my rad, hoses and other misc. cooling system items. System was air tight after doing the work as I checked with Airlift 5000 and held 25 psi for 2 minutes plus. Oil temp and coolant temps were within 2 to 7 degrees of each other before doing the Duraseal fix attempt. Did it on the weekend of 12-27-2014. After fix, drove truck at least 75 miles and coolant to oil temps deltas were 30 plus degrees without a load, more with a small load on. Local Ford mechanic encountered another person with same problem after attempting to use product. It didn't fix the head gasket problem either. They want you to try another attempt for free but why would you make the problem any worse. They won't refund your money after this either. There is no bending with this company. They claim to formulate for individual engines, so they should be willing to refund the money if this sort of thing happens. The tech was trying to say there was something wrong with the cooler before hand, but that's impossible with the minor temp difference. I even used there flush before doing their procedure. It would be good business practice to refund my money under these circumstances since it didn't work and it clogged a perfectly functioning oil cooler. DO NOT BUY DURASEAL! They are a no compromise company! They are unwilling to satisfy when the product doesn't work and does harm to components!
I used Dura Seal on my truck and it worked great! That was almost 3 years ago and its still holding. It sounds like your problem was always the oil cooler since you were having temp problems with it in the first place! The trick to getting a good seal is having a correctly working coolant system its ok for the head gasket to be bad BUT you need the oil cooler, radiator, heater-core and water pump to be working correctly so the DuraSeal can do it's job... I've been a mechanic for over 30 years and know there's nothing wrong with Dura Seal you just need to use it correctly as with anything else. If your oil cooler had been working correctly before using duraseal I'm sure you would have gotten a full seal just like I did.