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It depends what sort of stop leak you're talking about. There's different types.
Something for a leaking windshield rubber works by filling a gap and then becomes hard, similar to how bathroom sealant works.
An oil stop-leak works by penetrating and 'refurbishing' -swelling- dried gaskets and then hardening when it contacts the air on the outside of the engine block.
Some types of coolant sealant work by allowing particles to congregate/collect around a small hole in a radiator, blocking the hole. The particles harden due to the air/heat to form a plug. This type of sealant can also block your heater matrix, and they do not repair rubber hoses (hoses must be replaced if leaking).
A cylinder head sealant works by either depositing particles in a small crack in the head or gasket, or in the case of a modern head sealant, it uses polymers.
If you have a slight oil leak - slight - on an engine or auto box, try a sealant. If it's anything more than a slight weep, then gasket/seal replacement is the best option.
it depends upon what your problem is. If you have a badly blown head gasket then nothing will work, or if it is a small leak either into the water system or into the sump it could possibly work.So could you please give some more information about your problem.I hope this helpsregards
My personal experiences with gasket sealers for Head gaskets has been very poor due to the fact that it's difficult for the sealer to stick in the leak when there's so much combustion pressure trying to push the sealant out of the leak on one side and only about 17 psi of coolant pressure trying to keep it in from the other side. On both a 2.0L or a 2.4L engine I would suggest having the head removed and inspected and the gasket replaced....then your problem is fixed and done. Sealants may work for a while but I view them as a temporary band aid approach at best. If you have over 100,000 miles on the engine and haven't yet replaced the timing belt then it would be a good time to do that also as a worn timing belt can cause some pretty severe engine damage should it fail. Hope this helps and good luck!
Intake bolt torque is 11-14 foot pounds. Note: to torque bolts & nuts, start in center using crisscross pattern working outward. And as Far as the sealant goes, you shouldn't need any additional sealant since the new gasket has sealant.(just make sure both surfaces are clean an free of oil.) sometimes if the head or the block show signs of pitting on the matteing surfaces then you could use a litttle of that cooper spray gasket to coat the new gasket.