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Old 05 Mar 2011, 06:16 pm
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Default Will My honda Accord 4 cylinder 2006 last longer if I put 91 octane instead of 87.?

I bought my Honda accord from my sister a year ago with about 85000 kilometers on it in decent condition and I changed oil from mineral to synthetic . My Mechanic says changing the oil at 85000 kms is okay but at 150000 he said it's better to keep using the same oil. My cousin and my friend who is a mechanic both tell me to use super gas 91 octane because they say it is cleaner for the engine and less junk will built up in the engine and that my car will last longer. On my owners manuel it recomends 87 octane and that's what I am going to start to put.
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Old 05 Mar 2011, 06:31 pm
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It's designed for 87 octane and there's nothing at all to be gained by going to higher octane. Follow the maintenance recommendation for fuel filter change. A clogged filter will stall you.
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Old 05 Mar 2011, 06:46 pm
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It doesn't matter if you put the higher octane fuel in it because the engine was designed to run on 87. It can run on higher octane, but it is just more expensive for nothing.
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Old 05 Mar 2011, 07:01 pm
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91 would be cleaner for your motor. I always put premium on any car i drive. Its good for the long run
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Old 05 Mar 2011, 07:16 pm
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The cousin's information was exactly correct sixteen years ago, and was accurate to some extent seven years ago.

In 1995 the EPA changed the standards for detergent levels in gasoline, and that caused almost all refiners to reduce detergent levels in at least the lower grades (and in most cases all grades) to barely meet the standards. Detergent additives are expensive. That worked okay in some engines and not so much in others. In 2004 a consortium of car manufacturers developed their own standard that required higher detergency than the EPA minimum, and they named that standard Top Tier. By now a lot of brands conform to the Top Tier standard (BP refuses to participate and has their own detergency standard they insist is higher then Top Tier) - see the second source. All grades of Top Tier brands must conform to the standard.

EDIT - BTW, I changed to using Top Tier brands regularly after I noticed a lot of complaints on car forums about detonation when accelerating, and on post-1996 cars that has to mean carbon deposits in the combustion chambers. Knock sensors do an excellent job of heading off ignition induced detonation, so the knock has to be from pre-ignition and that means combustion chamber deposits.

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Old 05 Mar 2011, 08:16 pm
Join Date: May 2010
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No.Most ask the opposite question if lower octane will damage the engine.People are downgrading to save have you noticed the price of fuel?Switching oil to synthetic is another opposite strategy for the times.

Oil and gas questions get motorheads lusting for deluxe.You are frying bacon in front of the dogs you must work for big oil.If they cannot sell more they want to sell better.Private jets do not have a sticker of a boy peeing the jet itself makes that point.

Loud mufflers are a trick to make seventeen seconds to the quarter mile go by faster.Loud mufflers are the opposite of Kennedy's quote.We do it because it is easy not because it is hard.Notice the cello in the back seat and bumper sticker that says my other car is a Cessna.
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