Qcman17
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- May 14, 2019
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- Cam
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- 2019 Mustang GT A10 Velocity Blue 301A
I notice on the Motorcraft oil container that the oil is blended to combat LSPI. I know that is generally a problem more for turbo engines but I wonder if the octane of the fuel could help that potential condition as well? I think that is what you are basically saying too.The unstated assumption in all of these is "in a clean engine".
Assuming the engine is clean and unmodified, there's no economic benefit to using higher octane levels (you'll never get the cost differential back in improved mileage) and likely little to no performance benefit on public roads at legal or moderately illegal speeds.
Add a bit of hot carbon to the mix and things can go a bit off. Carbon based detonation is harder to control with knock sensors and under some conditions (lugging the engine down comes to mind) may not be able to be avoided even with added knock sensors.
So, post-2018 with the dual-fuel path keeping the valves clean, you're likely fine with good quality 87 (major manufacturers with more-than-minimum detergents). Using the cheapest 87 you can find from a station you never heard of before? There could be some issues.
Same thing if you've got an engine that's burning some oil. You could get carbon buildup in a cylinder, and the detergent levels in any gasoline may not help. In that case, a bit more headroom before detonation with a higher octane level could be advantageous.
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