87 Octane in 6.2L

[high country]

I gave up cigarettes for the 6.2, both the truck and myself run better and breath easier and I am still spending less money every week. Talk about a win win win.

[Durtywimmin]

Website showing ethanol free stations in U.S. and Canada

http://pure-gas.org

[white1500]

lol at 87 on 6.2. I won't even use that with my 5.3!

 

#firstworldproblems

lol at 87 on 6.2. I won't even use that with my 5.3!

 

#firstworldproblems

[PMattras]

What about "Top Tier" or 76 which is added to gas for better performance? I see Shell, Mobil, Exxon and Valero are claiming in their gas. Is there any merit to their claims?

 

http://www.toptiergas.com/

 

TOP TIER Detergent Gasoline is the premier standard for gasoline performance. Seven of the world's top automakers, BMW, General Motors, Honda, Toyota, Volkswagen, Mercedes-Benz and Audi recognize that the current EPA minimum detergent requirements do not go far enough to ensure optimal engine performance.

[Roader]

I dont have info on These but after comparisons of 87 and 93 on other GM cars on Dyno with sensors hooked up you are crazy to use 87. Even v6 camaro was knocking bad with 87 at higher rpm's.

[redwngr]

What about "Top Tier" or 76 which is added to gas for better performance? I see Shell, Mobil, Exxon and Valero are claiming in their gas. Is there any merit to their claims?

 

http://www.toptiergas.com/

 

TOP TIER Detergent Gasoline is the premier standard for gasoline performance. Seven of the world's top automakers, BMW, General Motors, Honda, Toyota, Volkswagen, Mercedes-Benz and Audi recognize that the current EPA minimum detergent requirements do not go far enough to ensure optimal engine performance.

Octane rating is octane rating.

Top tier is more about fuel stabilizers and cleaners, the correct octane rating is still required for best performance.

[Muscle Car Memories]

Before somebody starts ranting and raving about being a cheapskate, this was done only out of curiosity! My last fillup was with 87 Octane. I have used 93 since the truck was new but wanted to see if there was any performance/mileage difference. Mileage difference was very little, if any. Back and forth to work, 36 miles RT, I still saw 19-20 MPG. I did notice some performance drop when accelerating hard, but it still was a beast. I dont think I would ever consider 87 if I were towing, and after this tank, I will go back to 93....its only about $6.00 difference in a fillup. I was curious because I have a 2003 Vette, and the difference was quite pronounced in that car....2-3 MPG difference. I expected a drop, but didnt notice one with the Silverado. Still, probably the BEST vehicle I have ever owned!

 

Ive had quite a few Muscle Car such as Mustang's and Camaro's and I got used to using 93 premium so I still use it in my Silverado with the 5.3 but I doubt there is any performance or mpg gain.....

[aczr2k]

I use whatever in mine, if premium is 50 cents higher its getting 89. For cruising down the highway empty and around town I don't see it causing a problem. I've never heard mine ping but I don't drop the hammer at every stop light nor do I drive WOT on the highway like some of you must do.

[Silverado-Hareek]

I run Shell 89 in my 5.3 based on the recommendation from Black Bear to run minimum 89 in these engines. If I had a 6.2, I'd run 93 per the manual.

[Isriam]

I see no reason you can't run 87 or 91 in a 6.2. this is what the manual says. then again this forum has a lot of people beating their chest demanding you do what they think is best.

 

If the vehicle has the 6.2L V8 engine

(VIN Code J), use premium

unleaded gasoline with a posted

octane rating of 91 or higher.

Regular unleaded gasoline rated at

87 octane or higher can be used,

but acceleration could be reduced,

and an audible knocking noise may

be heard.

[SMiller]

Why is the 6.2 not E85 compliant? Seems it would make monster power on it and no worry about spark knock or timing.

[ahahnu]

I only use Sunoco 93 in both car and truck. Was 94 until they did away with it. The lawn mower repair shop says not to use 87 because it eats the carb and lines. If that's just a mower/ yard toy I can only imagine what it does long term to a car / truck motor.

[OhmMega]

You guys should read about detonation. Its not as prevalent in computer controlled engines because of spark retard applied by the computer when knock (detonation) is detected.

 

But gasoline can still detonate without spark when heat and compression are high enough. With our aluminum engines running at higher temps then the old iron counterpart, and the higher compression allows for greater chance of detonation.

 

You can put diesel in your 6.2 for an exaggerated effect if you feel brave.

[aczr2k]

I only use Sunoco 93 in both car and truck. Was 94 until they did away with it. The lawn mower repair shop says not to use 87 because it eats the carb and lines. If that's just a mower/ yard toy I can only imagine what it does long term to a car / truck motor.

You realize we are talking about two very different things here. What your so called experts at the mower shop are saying about 87 octane is because generally it has ethanol in it. We have several small gas engines around our farm oldest being 40 years old and still run fine & that's with using 87 octane with ethanol. Many of these problems are blamed on ethanol but it really comes down to poor maintenance & proper gas storage. 87 octane fuel is NOT going to eat carbs or fuel lines. The same guy bitching about his engine that doesn't start is the same guy with a steel gas can sitting in the back of the truck year round in the weather.

 

You fanboys buy what grade of gas you want I'll buy whatever 87,89,91 I'll bet our trucks both will have the same longevity, it really makes no difference to me, mine will be traded before 100k regardless & I don't give two craps about the next guy.

[Isriam]

i only run 91+ because i have a custom tune for it, and because i don't want warranty issues later. i don't think 87 will break your engine. manufactures build cars like most anything else. dumbed down for the average consumer so they cant break it.

 

a perfect example is a phone or pc processor. they run at 2.4ghz or 1.5ghz from the vendor, but you can actually run them at 3.0ghz or higher if you know what you're doing. the manufacturer dumbs them down so the average user CANT break them and they will run under any condition. you can take an intel processor thats 2.4ghz and overclock it to 4.0 or 5.0ghz easily and it will run for years.