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On any port injection or GDI engine equipped vehicle, installing a true air/oil separation system (not the average "catchcan", but something like Elite Engineerings newly released E-2X system for GDI engines) that scrubs, removes, and traps the oil/water/unburnt fuel/and other combustion byproducts from the PCV system, and thus further the intake air charge (especially newer GDI engines) you eliminate most of the detonation caused knock retard, and this allows the engine to operate at optimum spark timing advance. Thus more power, cleaner burn, and better fuel economy (1-3 MPG average for full size vehicles, more on compacts). This also eliminates most of the coking, or deposit build up on the backsides of the intake valves that over time results in gradual reduction in fuel economy, power, and an increase in emissions as the valve deposits build wearing the valve guide prematurely as well as other issues.
Here are examples:
(Note, I can't post images yet...will follow up later with them)
And no, top tier fuels and additives added to the fuel tank can do nothing to prevent or help this as fuel no longer showers the intake valves keeping them clean and cool as port injection:
Today's engine fuel never touches the backsides of the valves so as all gasoline comes from the same distribution, paying more for a "top tier" does absolutely nothing now days as it never touches the valves. So waste of $ big time. Also, the argument that the injectors need it is also unfounded as now the fuel is introduced at 2000-3000 PSI basically "pressure washing" the insides and the tips so we rarely see deposits clogging them ever form unlike port injection that operated at 45-55 PSI.
Also, if you use a solvent based upper induction cleaning, you risk damage to the cylinder walls and pistons as well as the catalytic converter due to the very hard particles that are breaking loose and smaller ones forced between the piston and cylinder walls, causing scouring, or scratches. Then if you have a turbo equipped engine these hard particles & chunks are impacting the exhaust side of the turbo and damaging the leading edges of the turbine blades.
Much misinformation out there, and no automakers are admitting any of this, but if you have a GDI engine vehicle, you really need to learn all there is involved with the care of these unlike a port injection engine that could go several hundred thousand miles and see zero deposits on the intake valves.
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