Re: oil, gas options?
At the same time, you are liable to lose power if you run too high an octane since the higher the octane the slower it burns and the more advance you need. 91 is not common where I live so I mix 93 and 89.
To properly burn higher octane you would need help from a tuner. I am surprised that the N/A and Boosted engines have the same octane requirement.
Yesterday was 7 gallons of 93. Suppose I could split fill but do not feel that is necessary.
I suspect that is 91 octane at sea level as I am, at high altitudes such as Denver, it is less.
When lead went away there were issues with exhaust valve seat recession but just about everything has hardened seats these days. Still I like the fact that the 3.2 seems to be a cool running engine, mostly reporting 185-190.
Also yes you can really damage an engine with excessive detonation but the sensors would be the least of your problems (and anyone who cannot feel detonation has a different problems) but the first thing that will happen is the MPG will head for the garderobe and if you watch you will see almost constant knock retard going on.
Old pushrod engines (the Hemi has many of the same issues and some of the same kludges like dual plugs) have the same problem but moreso as a 4" bore makes the detonation issue worse than for the XF. The 400RA in my Judge is also 10.25:1 (and is optimistic) but wants/ needs 98 Research which is about 94 PON so I run 93 plus additives (most octane improvers can add almost one octane number).
If anyone wants to discuss the magic of combustion let me know.