I need some help. Bought this 300D with 178K miles. It had low oil pressure at idle with 10W/30 oil in it, so I took a chance. Changing to 20w/50 oil didn't change anything. Changed oil pump, still low oil pressure at idle. At 80 degrees C, idle oil pressure is 0.3. Changed main and rod bearings and oil pressure is the same. Can anyone give me some opinions as to the trouble? Thanks! Dutchman830. P. S. Just found out about this site.