Dave. I too am interested in. What criteria was met to determine that you=
had great success with that motor flush? I had heard of people using this=
type of produce. Sludge build up was very common prior to 1963. As crank=
case ventilation was done by of a road draft tube. This tube generally we=
nt down next to the bottom of the oil pan. To be in the air stream under th=
e engine. Was cut at an angle to help create a low pressure area at the end=
of the tube. This angle cut helped to pull fresh air in the oil fill cap =
that had a crude filter media in it. In 1963. The Fed mandated that a Posit=
ive Crankcase Ventilation ( PCV ) system be put on all cars/trucks sold in=
the US. Calif preceded this Fed action. The PCV system used that vacuum i=
n the intake manifold to remove these contaminates from the crankcase. Prio=
r to 1963. Few engine ever made it to 100,000 miles. The main contaminant t=
hat shortened engine life was carbon. The PCV system was a great move forwa=
rd for extended engine life. EFI has also moved engine life farther out. B=
y way of decreasing crankcase contamination/carbon. This is how synthetic =
oils started to be more viable with engine produced in resent years. Thus a=
llowing longer oil change cycles. Our 403/455 will NEVER get to the point =
of the engines that are produced in recent years. PIRIOD. Thus we will stil=
l need more frequent oil/filter changes to remove the contamination that do=
n't get picked up by the oil filter. We see a lot of engine hitting over 25=
0,000 miles on mineral oils. Remember that our oil filters ONLY remove the =
larger pieces of carbon that slowly eat up YOUR engine.. Frequent oil chang=
es remove the rest. Thus back too. Your monkeys. Your circus to do to do =
as you wish. I change all my lubes more often then recommended by GM. Oils =
cheep. Part/labor aren't. Bob Dunahugh With an over maintained 78 Royale=
had great success with that motor flush? I had heard of people using this=
type of produce. Sludge build up was very common prior to 1963. As crank=
case ventilation was done by of a road draft tube. This tube generally we=
nt down next to the bottom of the oil pan. To be in the air stream under th=
e engine. Was cut at an angle to help create a low pressure area at the end=
of the tube. This angle cut helped to pull fresh air in the oil fill cap =
that had a crude filter media in it. In 1963. The Fed mandated that a Posit=
ive Crankcase Ventilation ( PCV ) system be put on all cars/trucks sold in=
the US. Calif preceded this Fed action. The PCV system used that vacuum i=
n the intake manifold to remove these contaminates from the crankcase. Prio=
r to 1963. Few engine ever made it to 100,000 miles. The main contaminant t=
hat shortened engine life was carbon. The PCV system was a great move forwa=
rd for extended engine life. EFI has also moved engine life farther out. B=
y way of decreasing crankcase contamination/carbon. This is how synthetic =
oils started to be more viable with engine produced in resent years. Thus a=
llowing longer oil change cycles. Our 403/455 will NEVER get to the point =
of the engines that are produced in recent years. PIRIOD. Thus we will stil=
l need more frequent oil/filter changes to remove the contamination that do=
n't get picked up by the oil filter. We see a lot of engine hitting over 25=
0,000 miles on mineral oils. Remember that our oil filters ONLY remove the =
larger pieces of carbon that slowly eat up YOUR engine.. Frequent oil chang=
es remove the rest. Thus back too. Your monkeys. Your circus to do to do =
as you wish. I change all my lubes more often then recommended by GM. Oils =
cheep. Part/labor aren't. Bob Dunahugh With an over maintained 78 Royale=
