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I would recommend nothing but 91 or higher in these cars!!
I don't necessarily disagree but the octane level doesn't make a difference to the sulfur deposit problem as far as i know.
On another note, my understanding is the computer on the C5 will adjust the engine timing to deal with lower octane if that's what you are running but the car doesn't run as well or get the same gas mileage on lower octane so it's a false economy to do that.
One large bottle added to a less than half full fuel tank and then fill the tank. It will help dissolve oxidation on the fuel sensors due to the small amount of sulphur in the fuel.
Agree on the octane comment although I think with the 94 octane available at Chevron in Canada it doesn't have any ethanol if that's a concern to anyone. I suggest using the Techron concentrate once in a while and always using Chevron gas to get the constant Techron additive in the gas. And no I don't work for Chevron but I have experienced the crash to zero gauge problem and Techron seems to have fixed it.
In my area , which is Central New Jersey, I can only find 93 octane w/ 10% ethanol so I dump a bottle of Techron in about every 3 months
Techron, Seafoam, and Redline SL-1 (probably others: Gumout, etc) are all about the same product. All have naptha and/or polyether amine.
I personally have had best luck with the Redline product. I like Redline the company as well - you can call tech support and talk to a real live guy in Benecia, California!
Run decent gas. Brand is not important despite the advertising, don't be a sucker, they all have to hit the same standards.
Run a can of (insert your cleaner here) once a year or so through half tank of gas. Good preventative maintenance.
I believe it is all hype but use if it floats your boat. I have 7cars and don't use and have combined total of over 650,000 miles with no issues. My opinion only and regular gas won't affect your car only give little less power but won't harm engine if over 97 octane. In your manual
After a mechanic at a dealership told me that Techron was a part of their $99 fuel injection service I've been using a bottle of Techron twice a year since I got my 04' back in 06'. Once after it's winter nap and again in the middle of the summer. Have never had a fuel related problem (Knock on wood).
I believe it is all hype but use if it floats your boat. I have 7cars and don't use and have combined total of over 650,000 miles with no issues. My opinion only and regular gas won't affect your car only give little less power but won't harm engine if over 97 octane. In your manual
Posted by ET.... A GM Engineer involved with the development of the LS1
The problem with low octane fuel is detonation. Unless you live in a high altitude area, detonation is critical. No you don't have to hear or feel it.
you mentioned good fuel economy, but are any of these motors seeing 200/300,000 miles. low octane fuel in an LSX engine causes wrist pin damage, engine knock, connecting rod and main bearing damage one very evident thing we found in two years of testing was low octane fuel in an LSX engine cause #7 piston to deteriorate. Many people think that if the engine does not blow up in 100,000 miles that what they are doing is ok. You don't put lawn mower gas in a high compression engine. You need octane to make sure the piston makes it to the top of the stroke. 89/87 octane in a high compression engine will never accomplish that. You want the spark to cause ignition not the compression of the engine, Unless you retarded the spark enough to allow for proper detonation , but at a definite disadvantage in performance. Taking timing off an engine reduces HP , just like advancing timing increases it. Having the engine knock sensors back off the timing reduces performance, but also the engine has to knock to accomplish this. engine knock reduces engine life. 87/89 octane causes engine knock under load, in a high compression engine like an LSX. Its OK to use this in order to get you to a station that has the proper fuel. Its not designed to be used daily.