Quote:
Originally Posted by WardL
As the engine ages, the octane requirement will increase until it levels out at 87 (assuming 87 is the manufacture's fuel recommendation).
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Combination of rings bedding in, (which doesn't take long) and the carbon buildup that ALL engines burning a hydrocarbon get.
The compression ratio goes up from the carbon buildup.
Water injection keeps the carbon buildup to a minimum and also suppresses/minimises detonation.