Reading the holden manual it says the vy v6 takes 5.5 lt of oil with filter and if I'm wrong please exuse me.Now i put this amount in I used Castrol GTX3 15W -40 and the oil on the dip stick is between Add and Full just in the middle is this ok or is there simply not enough oil??.Also speaking to a vechile inspector he said to me the v6 motors dont like there oil to run much past 10000ks or else they start to chew a bit of oil is this true beacause someone else told me as long as you put good quality oil getting 15000ks out of it should not be a problem at all.