(i have a 85 chevy caprice classic with a 6 cyl fuel injector) i used 92 at the pump for the first time i usually use 93 and went 1 exit on thehighway and my car started to overheat. my thermos guage was at its end and now its making a god awful noise. what to do
This is not a problem that was caused by your gas. This most likely just happened at the same time. It sounds as though you now have a blown head gasket. one way to check is pull the oil dip stick and look at the oil. If it is a milky dark grey color then there is water in the oil and you have defiantly blown the head gasket. If the oil still looks ok then have a mechanic run a compression test. The overheating was most likely caused by a faulty thermostat or low water in the radiator. The compression test will tell you definitely weather or not a head gasket is blown. If this is the problem then it could cost somewhere around five(5) to eight(8) hundred dollars to repair. Another sign of a blown head gasket is a very rough idle. Hope this helps. Good luck.
The chances of the very minor octane change causing damage like you are describing are so slim they are non existent.
Your overheat problem just happened to coincide with this fill up. If you have motor noise that sounds deep and thick like a hammer inside the motor or followed by a chirping sound you have already blown the motor.
I would start pricing a motor and know that under no terms did this difference in fuel octane (if it was good fuel) cause this damage.
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Get your car to a mechanic. You shouldn't have problems like that from switching to gas 1 octane point lower when you don't need that high of grade to start with.
Would you describe the noise it's making and where you think it's coming from -- maybe open the hood and listen?
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