http://www.underhoodservice.com/gdi-syst...-intake-valves/
Since oil formulation is a work in progress, I’ll summarize by saying that oils used in GDI, particularly in turbocharged GDI (TGDI) engines, must meet much higher standards than the generic oils intended for conventional, naturally aspirated fuel-injected engines.
Oils intended for use in a GDI engine must have enough scuff resistance to protect the camshaft that drives a high-pressure mechanical fuel pump capable of developing well over 2,500 psi of fuel pressure. [color:#FF0000][/color]
Since oil formulation is a work in progress, I’ll summarize by saying that oils used in GDI, particularly in turbocharged GDI (TGDI) engines, must meet much higher standards than the generic oils intended for conventional, naturally aspirated fuel-injected engines.
Oils intended for use in a GDI engine must have enough scuff resistance to protect the camshaft that drives a high-pressure mechanical fuel pump capable of developing well over 2,500 psi of fuel pressure. [color:#FF0000][/color]