Am I Imagining Things

[Rolm]

Man oh man this 3.8 is running so nice on premium gas that I will never go back to regular again.

[Rolm]

An update on my use of premium fuel, I noticed that my exhaust pipe has blackened vs when I was using regular fuel. When I used regular fuel the end of the exhaust pipe was clean, now I see that it has blakened. I have to assume this due to all of the extra cleaners in the premium fuel and it is cleaning the engine and the exhaust system. Any thoughts out there.

[Jimmy Olsen]

Originally Posted by Rolm

An update on my use of premium fuel, I noticed that my exhaust pipe has blackened vs when I was using regular fuel. When I used regular fuel the end of the exhaust pipe was clean, now I see that it has blakened. I have to assume this due to all of the extra cleaners in the premium fuel and it is cleaning the engine and the exhaust system. Any thoughts out there.

If that is the case, then I would assume that eventually the tailpipe will become clean again once all the deposits are removed. Keep an eye on it and let us know what develops down the road.

Jimmy

[swspecailists]

I can buy stp injector cleaner for a buck and use it on 2 tanks. does this give u the same thing as high dollar gas. it would be cheaper to add it myself with the high octane stuff 25 cents more a gallon.

[LittleHoov]

The many so-called octane boosters boost the octane level by next to miniscule amounts, something like .1 point. I cant remember the exact number, but almost all of them are a waste of money. Either way it wouldnt raise your octane level enough to compare with buying premium gas. Which Im not convinced the 3.5 needs, and I know the 3.8 doesnt, but whateva.

[Jimmy Olsen]

Originally Posted by swspecailists

I can buy stp injector cleaner for a buck and use it on 2 tanks. does this give u the same thing as high dollar gas. it would be cheaper to add it myself with the high octane stuff 25 cents more a gallon.

The really good detergents, like Techron, cost about $6 to treat 12 gallons. If you buy top-tier gasoline, regular grade, the cost is not that much more than other gasolines and there is no need to buy more additives. Gasolines that are significantly lower in price usually contain a lot of ethanol.

[panzer dragoon]

octane boosters and lead additives are a must is some conditions. Older engines can get real hot and get pre-ignition issues. Marvel Mystery oil is also used in aircraft engines to keep carbon off the valves of a hot engine. I swear by them.

Valves will start to stick with a build-up of carbon and heat. In a rotary- air-cooled aircraft engines the situation almost mandates their use.

For my 1966 440 Charger I will use the lead additives when it is warm +70-80 deg F. That engine runs hot and the pistons are large = detonation issues. +the timing adjustment is not automatic like the Intrigue. -and that is on premium gas (or whatever crap they sell as premium now).

Does the Intrigue need these additives? A little fuel injector cleaner ever 3 tank full may help. The aluminum block of the 3.5L dissipates heat well.