Normally it will last the life of the engine. However if the engine overheats the gasket can be ruined immediately.
Not very long as it is only an emergency repair. The only fix for a blown head gasket is to replace it.
Never use sealant for a head gasket! It is used as a quick fix for cracks in the gasket but will not last very long. Safer to get the job done correctly.
There is no way of saying for sure. As long as the engine never overheats and you change the coolant every 50,000 miles it should last the life of the engine.
If a head gasket is leaking, it has already failed and needs to be replaced and if you keep driving this vehicle you will bey buying a new engine.
Every time you start the engine you are doing damage. The coolant will mix with the oil and coolant is a horrible lubricant. How long you should drive it is none at all. Do not run this engine with a blown head gasket or you will be paying for a complete overhaul or buying another engine.
My 1971 chev truck has 319,000 miles on it & the heads have never been off - If U don't overheat the engine & KEEP the oil changed U shouldn't have a head gasket problem.* keep antifreeze & water pump lube in the radiator.
you dont, you will kill the engin!
It should take about 8 hours give or take...
If the head(s) were checked and had no cracks and the coolant never mixed with the motor oil it could last for many miles depending on how many miles allready on the engine.
bars leak will plugg up your heater core meny times, good luck!
depends on what engine the 4 cylinder should take a day if you have all the tooling
Nothing. There is nothing you can add to the coolant that will repair a blown head gasket or cracked head. There are products you can use in an emergency to possibly get you home but these are just temporary fixes that will not last long. The only permanent fix is to open the engine up, replace the head gasket or head if necessary. STOP driving your Toyota immediately or you will have severe permanent engine damage.