02-21-2013, 01:42 PM
I used 5-20 at the start but it burned it off and when I switched to 5-30 it stopped and seems to run better. I'd say 5-30, even my new st takes 5-30
2007 ZX4 2.0l unaturally aspirated
FSwerks stage 2 Turbo kit, Cosworth Intake Manifold, 3" custom HKS turbo back
regular stage 2 @10ps : 232whp/219wtq
stage 2 plus @ 13psi: 278whp/229wtq
Stage 2 plus @15psi: 296whp/240wtq
2013 Focus ST Tuxedo Black - The daily
FSwerks stage 2 Turbo kit, Cosworth Intake Manifold, 3" custom HKS turbo back
regular stage 2 @10ps : 232whp/219wtq
stage 2 plus @ 13psi: 278whp/229wtq
Stage 2 plus @15psi: 296whp/240wtq
2013 Focus ST Tuxedo Black - The daily