This is probably only going to make you madder John, But the spec. I get from Alldata is: KOER (HSC HSO) 45.0 - 60.0 KOEO HSC 45.0 - 60.0 PSI KOEO HSO 50.0 - 60.0 PSI I tried to attach a file but dont know how to do it. Alldata Just copies from dealer manuals ... Login to read more.