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Mr 5 0 · 08-22-2002, 08:33 AM

rppngears:

I see no real harm in using 93 octane (I use 94 and in 12 years I've never had the slightest gas-related problem) but as PKRWUD stated, running the lowest octane you can - without detonation - is probably the best way to go. If you can run advanced timing with 89 octane, go for it. If you can do it with 87, better yet. Experiment. My Mazda 2.0 runs 2-degrees advance with 87 octane, my Mustang won't do that and requires more. Every engine is different.

The gas companies do claim the higher octane gas contains extra 'detergents' to help keep injectors clean. This sounds plausable and my injectors are clean after well over 100,000 miles of using 94 octane but I've also heard this is BS to sell higher octane gas which also sounds plausable.

I basically ignore the 'detergent' factor (but suspect it's true from my own long-term experience) and just crank up the timing and fill up with Sunoco Ultra 94 every week. Works for me.

08-22-2002, 08:33 AM	#4
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	rppngears: I see no real harm in using 93 octane (I use 94 and in 12 years I've never had the slightest gas-related problem) but as PKRWUD stated, running the lowest octane you can - without detonation - is probably the best way to go. If you can run advanced timing with 89 octane, go for it. If you can do it with 87, better yet. Experiment. My Mazda 2.0 runs 2-degrees advance with 87 octane, my Mustang won't do that and requires more. Every engine is different. The gas companies do claim the higher octane gas contains extra 'detergents' to help keep injectors clean. This sounds plausable and my injectors are clean after well over 100,000 miles of using 94 octane but I've also heard this is BS to sell higher octane gas which also sounds plausable. I basically ignore the 'detergent' factor (but suspect it's true from my own long-term experience) and just crank up the timing and fill up with Sunoco Ultra 94 every week. Works for me.