Midgrade vs Premium
03-29-2015, 01:19 PM
#5
Le Mans Master
OK, read post 10 in this link. While he discusses 91 versus 93, you are not even using 91.
If you don't know who Evil-Twin is, he was a design engineer for the engine.
https://www.corvetteforum.com/forums...el-octane.html
PS: He does speak to 87 also.
If you don't know who Evil-Twin is, he was a design engineer for the engine.
https://www.corvetteforum.com/forums...el-octane.html
PS: He does speak to 87 also.
Last edited by dadaroo; 03-29-2015 at 01:33 PM.
03-29-2015, 01:23 PM
#6
Burning Brakes
- 
Normally a dime separates premium and mid-grade, so with a average cost on fill-up you might be looking at what, $1.80- 2.00 bucks. I hope your inquiry is based on something other than cost because your car deserves the best fuel as well as oil. I really should not have even posted to this because it's just common sense. Not bashing you OP, but really !! 
03-29-2015, 01:35 PM
#7
Le Mans Master
OK, read post 10 in this link. While he discusses 91 versus 93, you are not even using 91.
If you don't know who Evil-Twin is, he was a design engineer for the engine.
https://www.corvetteforum.com/forums...el-octane.html
If you don't know who Evil-Twin is, he was a design engineer for the engine.
https://www.corvetteforum.com/forums...el-octane.html
03-29-2015, 01:48 PM
#8
Team Owner
Three years ago, I was smelling gas, when the car was running, but nothing was visible. Long story short, the "o-ring" seal on the fuel filter was leaking, but the leak was invisible, because the fuel was dripping on a hot exhaust pipe and vaporizing.
New fuel filter, no more leak. My only suspicion for the leak was the ethanol content in the gas.....
03-29-2015, 02:19 PM
#10
Le Mans Master
03-29-2015, 02:35 PM
#12
Le Mans Master
03-29-2015, 02:45 PM
#13
Team Owner
A lot of people say that, but keep in mind, even the newest C-5s are now 10 years old, and gas, oil, and tires have changed in that time, so what was valid when your OM was printed, might not be valid now....
03-29-2015, 03:39 PM
#14
Safety Car
I hope you fuel your body with more care than you fuel your car. Many people don't , abd use that same logic, I"m still walking around, must be ok.
Some choices take time to develop, like liver damage, a fat gut, or an engine with one knock too many .
I was reading about one of the top engine builders in the nation, he has been in charge of many engine programs, including factory. He stated his first concern when he sells an engine is who is going to maintain it, what maintenance program do they have.
They don't fix themselves, and any deviation from expected operating conditions , like incorrect fuel, takes it out of intended design function and into stress.
I would think the computer would cover a slightly incorrect fuel choice for decades, if you drive like granny, but that is only a guess. I do know they are strong, designed to be released into a world full of mechanical idiots. (not attacking the poster here, I would think not asking the question might be idiotic.)
Some choices take time to develop, like liver damage, a fat gut, or an engine with one knock too many .
I was reading about one of the top engine builders in the nation, he has been in charge of many engine programs, including factory. He stated his first concern when he sells an engine is who is going to maintain it, what maintenance program do they have.
They don't fix themselves, and any deviation from expected operating conditions , like incorrect fuel, takes it out of intended design function and into stress.
I would think the computer would cover a slightly incorrect fuel choice for decades, if you drive like granny, but that is only a guess. I do know they are strong, designed to be released into a world full of mechanical idiots. (not attacking the poster here, I would think not asking the question might be idiotic.)
03-29-2015, 03:43 PM
#15
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I'm not going to risk my motor over a couple bucks of cheaper gas... for a stock or lightly modded engine it may be ok to run cheap gas but on some of our cars a bad tank of fuel and one wot pull will be the end
03-29-2015, 03:49 PM
#16
Le Mans Master
There is nothing in the years that have changed the engine while it was under your hood. The engine has knock sensors (2) that detect inferior octane fuel and cut the timing to keep from destroying your valve train. GM knew that some people are ridiculously tightwads and would use the cheapest **** they can put down the fuel inlet.
Of course cutting the valve timing also cuts your engines performance, but if your running **** through it, you must not be interested in your cars running their best anyway.
Good grief.....
Of course cutting the valve timing also cuts your engines performance, but if your running **** through it, you must not be interested in your cars running their best anyway.
Good grief.....
03-29-2015, 04:03 PM
#17
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If I am out on the road, need gas and can't find premium grade fuel, I have put 89 octane in the tank. And yes, there are places that do not sell premium fuel. But other than those rare circumstances, my car gets at least 91 octane in the tank.
