Another example of EPA/government mandated fuel economy wreaking havoc on engine longevity and actually increasing auto emission levels.
Cut and paste from a website:
In order to reduce frictional drag energy loss and increase fuel efficiency, gasoline direct injection (GDI) engines use thinner and lighter piston rings, called low tension piston rings.
Piston ring spring force in older port fuel injection (PFI) engines used to be as high as 30 psi. New PFI and GDI engines can have more than a 60 percent reduction in sealing pressure on the cylinder walls.
At the same time, new PFI and GDI engine compression ratios have increased from 9:1 to as high as 14:1. These higher compression ratios dramatically increase cylinder compression and the overall pressure for fuel ignition, sometimes as high as 2000 psi.
This huge increase in pressure creates more force on the low tension rings. Piston rings are supposed to prevent fuel and combustion gases from “blowing down” between the piston and cylinder wall and oil from moving up into the cylinder. But, low tension piston rings have a greater tendency to allow blow-by. Crankcase contamination compromises lubrication and promotes oil degradation.
Thank you EPA for GDI engines which, because of LSPI, run very rich at low rpms and create a lot of soot, thank you EPA for variable output oil pumps which are more complex and prone to failure, thank you EPA for smaller engines and lighter cars to promote fuel economy (plastic intakes, plastic radiator parts, etc..etc..) at the expense of engine longevity, thank you EPA for CVT's which can't be rebuilt when they fail, thank you for 0w-17 oil which I'm sure will really protect engine bearings. All of these technology innovations are a result of ridiculous EPA mandates to improve corporate average fuel economy resulting in disposable cars.
Yep, your car gets better fuel economy but all that oil consumption can't be good for the environment, right?
Don't get me started about diesel emissions which have ruined diesel engines with unreliable DEF/DPF and dozens of sensor that eventually fail.
Don't be surprised if GDI engines end up with particulate filters. THe exhaust tip on my Santa FE 2.0t has more soot on it than my 6.7L diesel F350 which wastes about 3 gallons of fuel every 200-250 miles during a 30 minute DPF regeneration.