A: What oil are you running? How long since a change? First thing I would do is change the oil and put in 15W40 Chevron Delo oil (Others have different preferences, but I found it slows consumption in most and keeps oil pressure up, plus it's one of the last ones to still have Zinc in it because it is diesel rated) From: speedyjeeper@xxxxxxxx Subject: oil usage 68' 199 To: mail@xxxxxxxxxxxx Message-ID: <ADVANCES62ZbLAX3cf30000142f@xxxxxxxxxxxxxxxxxxxxxxx> THe ol' 199 I6 in my rambler feels like it runs good, isn't noisy and there isn't any blowby but everytime I check the oil shes down a quart. I just got it a few weeks ago so I don't know the history..but I've been running it on the highway lately at about 65-70 mph. could it be the guides or valve seals etc? thanks