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When my original 305 engine in the El Camino was approaching 300,000 miles it had enough carbon buildup in the heads and on top of the piston to raise the compression ratio enough I would get spark knock with the regular. If I used the mid range it did not knock at all. When I swapped out the engine the new engine is happy with regular. That is the biggest reason I decided it was time for a new engine. Every 300K I will swap in another $1,700 engine.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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