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Mechanical Maintenance: Break-in / Oil & Fluids / Servicing Discussions on mechanical maintenance and servicing of your Camaro

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Old 04-13-2008, 09:03 PM   #1
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What gas will you be pumping?

Curious... what octane did forth gens require?
when you get your camaro will you be pumping 91?
what are the bad/good affects of using 10% ethonal fuel...
example sunoco 94 10% ethanol...
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Old 04-13-2008, 09:15 PM   #2
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GM states 89 Octane gas is good for all their vehicles. Even the Corvette, so I'm not wasting more money than I have to.
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Old 04-13-2008, 09:19 PM   #3
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Yeah, whatever the owner's manual calls for is what I'll put in. No more, no less.
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Old 04-13-2008, 09:28 PM   #4
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The higher the octane, the slower the combustion burn (less volatile). When you use a higher octane, the engine computer (ECM) can keep pushing the ignition timing advance for more horsepower.

Detonation (pinging) occurs when the combustion burn is too fast and the explosion of combustion slams down on the still coming up piston.

Most GM V8's have been using ESC (Electronic Spark Control) for many years. It uses a piezo-electric microphone to listen for detonation, and when it hears a certain amount (ECM see's this as a voltage from mic) it will back off the advance.

It uses an intricate logarithm you wouldn't beleive.

So, the higher the octane - the more spark advance and horsepower. As long as the engine uses ESC or similar.

We get 93 in Florida, that's all my Camaro will ever see. Ethanol does boost octane ratings, too.

Throw a can 104 octane boost (any auto parts store) in the gas tank and hold on!

Or you can use lower octane (more volatile) - (check owners manual) and save money for less horsepower.

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Old 04-13-2008, 09:48 PM   #5
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I've heard that you can use a lower octane fuel durring winter months. That would help if you drive your Camaro in the witer. I won't, so it doesn't mean a whole lot to me.
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Old 04-13-2008, 09:56 PM   #6
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Whatever makes cents for my annual gas budget.
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Old 04-13-2008, 11:04 PM   #7
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i know the way octane ratings affect your power and emissions... but will 10% ethanol have a negitive or positive effect...
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Old 04-13-2008, 11:14 PM   #8
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Quote:
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i know the way octane ratings affect your power and emissions... but will 10% ethanol have a negitive or positive effect...
In terms of performance...it'll be a minor positive effect (Ethanol = 105ish Octane rating, so figure 10% of your fuel is like that). Emissions...well, that 10% will burn with ~30% less emissions than the same quantity of gas - so that's negligible.

In terms of fuel economy, in case you were wondering, you may loose 1mpg.
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Old 04-13-2008, 11:19 PM   #9
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will it have long term effects on the enigne? if i use it every day...? if th car isnt ethanol compatable...
im not concerned with the performance... but more the reliability and constant usage affects?... are there any long term negatives?
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Old 04-14-2008, 07:36 AM   #10
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I've found over here in australia you pay more for the higher octane fuel but you get better fuel economy so it really pays for itself. Now I don't use anything else.
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Old 04-14-2008, 10:15 AM   #11
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Well im used to paying to for higher octane because of driving a german car all the time.... so im just going to stick with it.... and what Oz said above is true as well.... I find that you get better gas milage as well..... in the end i found that you end up paying about an extra 5 bucks tops for higher octane fuel to a tank after it all works out.

So I dont think its that bad. Its sorta like the synthetic oil vs. regular oil in your engine.... both are fine when it comes down to it.
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Old 04-14-2008, 02:16 PM   #12
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everyone has good points about things, but the OP question about octane req for 4th gens. the LT1 was designed to run 91 octane. you can run a lower octane fuel such as 89 and 87 but it will mess up your hp and your overall fuel economy.

with the reverse flow cooling incorporated on the LT1 engine, it allowed for a higher compression ratio which basically required the use of higher octane fuel to operate at peak efficiency

i run nothing but 93 in mine. gets expensive i know, but i like to run strong. lol
on the odd chance that i stop somewhere that doenst have 93, i keep a bottle or 5 of race only octane boost.
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Old 04-14-2008, 02:21 PM   #13
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I've used 91 octane in both my Zs and 87 in my Jetta and 4Runner. I'll run whatever GM says the engines require
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Old 04-14-2008, 02:25 PM   #14
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92 octane is all mine will ever see, weather its a 4th gen to a 09. Only the best for my baby.
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Old 04-14-2008, 03:03 PM   #15
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I've used 91 octane in both my Zs and 87 in my Jetta and 4Runner. I'll run whatever GM says the engines require
i just run the good stuff period. even in my 78 camaro with a 292 straight-6

tho i dont trust gm all the way on their choice of Mobil 1 for oil for 4th gens.

i run royal purple for everything on my car. oil, tranny fluid, rear diff fluid, and Purple Ice in my coolant. and here's why...

http://jcpm-inc.com/images/oiltest.pdf
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Old 04-14-2008, 03:04 PM   #16
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92 octane is all mine will ever see, weather its a 4th gen to a 09. Only the best for my baby.
what about 93? is it not as good as 92?

or like i do on occasion and run 112
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Old 04-14-2008, 03:07 PM   #17
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i just run the good stuff period. even in my 78 camaro with a 292 straight-6

tho i dont trust gm all the way on their choice of Mobil 1 for oil for 4th gens.

i run royal purple for everything on my car. oil, tranny fluid, rear diff fluid, and Purple Ice in my coolant. and here's why...

http://jcpm-inc.com/images/oiltest.pdf
I've heard some not-so-nice things about RP...clogging, gumming up.
I'll see if I can find where I read it.
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Old 04-14-2008, 03:40 PM   #18
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Question

what ever they say to use in it. I put 93 in my 68 Camaro.
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Old 04-14-2008, 04:02 PM   #19
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Whatever GM decides is what I will go with, as for my 95, I run 89 Octane whenever I fill it up.
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Old 04-14-2008, 04:07 PM   #20
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Originally Posted by CamaroSpike23 View Post
i just run the good stuff period. even in my 78 camaro with a 292 straight-6

tho i dont trust gm all the way on their choice of Mobil 1 for oil for 4th gens.

i run royal purple for everything on my car. oil, tranny fluid, rear diff fluid, and Purple Ice in my coolant. and here's why...

http://jcpm-inc.com/images/oiltest.pdf
I've heard mostly good things about RP. But that must have been an overseas test. I hadn't heard of a number of those brands. I only know of ELF because I occasionally watch F1.

What about Castrol Syntec? I used Syntec in my 84 Z28 and it stayed strong right up until the trans went Pompeii. Or Amzoil? Or Lucas? Though I think that may just be an additive.
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Old 04-14-2008, 04:21 PM   #21
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mobil 1 full syn for my enigne ill change coolant, diff, and tranny fluid every 50000

my only available gas will be either sunoco 94, 91 or shell 91...
and i really dont WANT to run 94 because of the cost and the 10% ethanol... i will run it if the camaro is E85 capable... but i will run 91 if it is not... and possiblly 91 shell even if it is... shell is CLEARLY the best gas but in canada they dont have better then 91... the only thing better is sunoco 94 10% ethanol
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Old 04-14-2008, 05:40 PM   #22
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I've heard some not-so-nice things about RP...clogging, gumming up.
I'll see if I can find where I read it.
id love to see it. only downside ive ever had to it is the price. lol tho you have to keep in mind that if you run good oil with a shitty filter, you get shitty oil.

key note... DONT USE FRAM. they are decent for dino oils, but thats about it. they dont work worth a crap with full synthetic oils. the mobil 1 oil filter is very good tho. i read an article that chopped a bunch of performance filters in half and ran them to compare
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Read that link that Spike posted, it'll tell you everything you need to know.
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Old 04-14-2008, 06:11 PM   #23
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I'll probably run whatever octane rating that's recommended by GM. They've designed it for that. These days, with computer controls as described earlier in this thread, an engine designed for higher octane can properly use lower octane. This means that you can use most octanes in most engines. The recommendation, therefore, is made by the marketing department; they have to balance potential power with potential fuel costs in an attempt to sell cars.

I'll almost certainly experiment with different octanes to see what actually results in the most efficiency for me, and run on that. My budget is very low.

I'll run 10% ethanol because that's the only choice around here. I don't think that gas with 10% ethanol has a higher effective octane than its rating; I suspect they figure in the effect of the ethanol when they formulate the gas. In my experience it has no noticable effect on power but may lower economy (which would match the fact that ethanol has less energy stored in it than gasoline). Also in my experience, 10% ethanol does no damage, even to engines designed decades before ethanol was in the pumps.

As for oil, I'll almost definitely go with whatever is recommended by GM. I've never heard of an engine failure attributable to oil where the manufacturer's recommendation was obeyed, so I see no reason to do something more expensive or difficult. Besides, I get tired of fixing suspension, electrical, and other drivetrain problems long before an engine dies.
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Old 04-14-2008, 06:40 PM   #24
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things to remember, the engine HP is based on certain assumed parameters, air intake, oil viscosity and coefficent of friction spark power, exhaust pressure, etc

you can "free up" some HPs by swapping in a better air filter, an oil with a lower friction will help with HP and get it to the wheels (also look at trans fluid and differential). A high power spark plug is also a good investment, Horspower TC put up a set of E3s on their 383 test block and got 6hp over another premium plug and small reduction in the lb fuel per hp
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Old 04-14-2008, 07:20 PM   #25
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Hopefully Ethanol, but 95 is the lowest octane level you can get here. I'm thinking I'm gonna be nice to it and give it only Shell's 99 octane V-power when I can afford it. That's of course if Ethanol isn't an option.
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