Yes, gasoline direct injection engines are pretty dirty in the intake ports and on the intake valves because they don't see fuel spray anymore. They still benefit greatly from top tier fuel though. Their injectors have much smaller orifices and tolerances than standard fuel injection. They also have a high pressure fuel pump (injector pump) that increases pressures to 2-3000 PSI that needs to stay clean. Top Tier fuel will definitely help keep these parts clean but it will not keep the intake ports or valves clean.
I think it might be worth spending a few pennies more per gallon for top tier fuel. I only hope we are getting what we are paying for though. With today's engines and technology, fuels and oils are becoming a lot more critical on using quality products to keep them alive and healthy.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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