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Old 02-11-2011, 03:04 PM   #101 (permalink)
darcane
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Quote:
Originally Posted by FourBinLabs View Post
If you go on to read further, it does state that it does not hurt to use lower octane fuel in a vehicle than what is specified if the vehicle does not knock (although a knock sensor would prevent you from knowing this). High elevation and low temperatures also allow the use of lower octane. If the vehicle is not knocking, then lowering the octane is no problem.

If you can advance your timing with the same octane you used before, you decreased your margin for error and reap the rewards of better mileage & torque. Buying lower octane for cheaper saves $, and causes no harm if it isn't making the vehicle knock. So diesel lowering the octane rating isn't necessarily bad.
It does state you can go lower, but the specific quote here is:

Quote:
Once you have identified the fuel that keeps the engine at optimum settings,
there is no advantage in moving to an even higher octane fuel. The
manufacturer's recommendation is conservative, so you may be able to
carefully reduce the fuel octane. The penalty for getting it badly wrong,
and not realising that you have, could be expensive engine damage.
I think most of the people warning against adding Diesel know this and are trying to inform you of the possible results. If you get your mix wrong, you will destroy your engine. If you know the dangers and still go for it, more power to you. I, for one, don't plan on giving this one a try and would still recommend others not to do it either.

Mike

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