Octane test report
Racer
Joined: Jul 2010
Posts: 262
Likes: 0
From: Jefferson City Missouri
If you don't believe the manual that the car should run on high octane why would you believe the company that the car needs more than 4 quarts of oil in it. If you cut back you probably would not feel it or hear it, at least for a while. If you are going to experiment by going to mid range fuel then the lowest octane why not drop back a quart on oil and next time drop back another quart...Why believe the manufacturer knows what is best! "Man up"
Melting Slicks
Joined: Apr 2008
Posts: 2,625
Likes: 242
From: Russell Ontario
St. Jude Donor '09
I'm sure my car can't tell the difference between Shell Esso Sunoco , or if it has 10w30 15w40 oil in it . if you drive hard fill her with premium, I don't drive ether one of mine hard and I don't have issues . to each his own. Non win argument . Why does the GM manual for an 05 grand prix says to change the oil every 10kms and my Buick says not to change till the computer tells you , both cars same year same engine and come off the same assembly line. My last oil change was 17,000 kms 
Race Director
Joined: Aug 1999
Posts: 11,123
Likes: 672
From: SE Pennsylvania
St. Jude Donor '03 thru '26
Oldtimer
Gasoline
Come on. The car is fine. I am not going to go out and wreck my Vette. It's a f'n science deal. It has performed perfectly so far. As soon as it tell's me other wise we will be fine. If it pings I think I might hear it. So far we have had no knock counts. This car hauls ***.
Well that was my problem and what the problem was that the intake valves had so much buildup of carbon and crap from using the cheapest gasoline lead to the cars engine not being able to suck enough Air/Fuel mixture around the carbon build up before the valv started to close. Now since the intake valve was closed there wasn't a suitable mixture in the cylinder and the spark plug fired but nothing cause there wasn't any, or enough Fuel / Air to have a combustion stroke hence it won't start. It only happened on cool morning is that is when the air / Fuel mixture is the densest, and does move as fast as the warmer lighter mixture does.
So the car had to have a extensive Fuel injection cleaning procedure. It wasn't covered by my GMPP warranty as they had already stated this on page 338 but No One ever read the goddamn stupid owners manual. Who knows if they had the outcome might of been different, But the dealership had the shop foremen and Steve Spencer stay after quitting hours and went over the Pontiac with a fine tooth comb. The engine had Spark, Fuel and compression, there/s no way it can't start. They checked the stroke, compression and the fuel, all pressures were fine but the engine don't fire. It came done to the only viable left, The fuel isn't making it into the engine. So the used a tool and a chemical that I don't know the name of but it was enough to break up the deposits on the intake valves and pistons. and I have to put bottle of Chevron/Techron injector cleaner in with every other fill-up. But I'm going to get a new set of Bosch fuel injectors because I still in the morning with the engine warming up up at 1000 RPM I can feel on of the injector stumbling ever so often till it hits the 150 degree mark. But whatever, good luck pal.
They didn't charge me for the work, instead they and I work out a plan that I pay for the rental car and they cover the work done on the engine. So that is what happens if you use 87 octane instead of 91. But you mostly won't keep the car long and that next smuck deal with the problem , if they ever crop up. s I said I respect you and you can do whatever with it. I wish you good luck and a nice safe summer !
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
If you don't believe the manual that the car should run on high octane why would you believe the company that the car needs more than 4 quarts of oil in it. If you cut back you probably would not feel it or hear it, at least for a while. If you are going to experiment by going to mid range fuel then the lowest octane why not drop back a quart on oil and next time drop back another quart...Why believe the manufacturer knows what is best! "Man up"
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Oct 2005
Posts: 2,989
Likes: 352
From: Carson City Nevada
I have to disagree on this. I run 87 in mine. Went on a 3,000 mile round trip, just using regular and got 32 mpg. I haved used regular in 4 c5's and a c4. No problems at all. Only time I've used premium was in the 62 and 65.
Thread Starter
Drifting
Joined: Jul 2011
Posts: 1,509
Likes: 10
From: Bay Point California
Octane test
Your point? Look. I'm not an idiot here. I will not hurt this car. I love it. We love it. It's really the wife's car. I just drive it every chance I get. Every dollar I can save is good since I plan to retire soon.
So far mid grade is working out just fine. Stay tuned. All you haters just pipe down.
So far mid grade is working out just fine. Stay tuned. All you haters just pipe down.
Melting Slicks
Joined: Dec 2003
Posts: 2,857
Likes: 2
From: pawleys island sc
However, it is your car. I think there's a post on cat **** somewhere above, might be worth a try.
Team Owner
Joined: Mar 2006
Posts: 27,567
Likes: 99
From: San Diego
