I agree with everything that srk said about the injectors except the last part .
A sticking anything will make more noise.
Just as changing the viscosity of the oil will change the way the motor sounds .
BUYER BEWARE,
Brand new member who does not want to fix a expensive vehicle.
Would rather part it out involving more work?
Something does not seem right.
Sounds like a stolen car to me ?
Closed for new member sales .
It is hard to tell the changes in gas octane as the engine will compensate.
It does get less power as you physically cannot use the full range of its timing advance with lower octane fuels.
It will change the throttle response and shifting on most drive-by wire vehicles also.
MY ls shfts like crap with lower octanes.
I agree with not using it in the engine but it is a high detergent fluid.
Not even close to it being an old wives tale as be a fluid with high cleaning additives and properties.
You don't have a transponder key. The tumbler is still jammed and needs cleaning. If it is binding that bad now stop putting any key in until you clean it.