old holden V6 came factory with faulty cams and ill fitted bearing.thats what appens when you rust proof imported blocks and machine them here in OZ.
then add local cyl head design.
new V6-well-75 000 KM oil changed ever 15K[comes out like soup] oil filter has chunks of chain guide material-change the oil and the timing sencors set a trouble code due to the chain lash--got to luv them.
we have some for sale soon.
PS-holden V8 always came with faulty cams-that's why the ran good with mild aftermarket grinds.

