I see some still don't understand why a anti-drain back valve is beneficial for an engine.
It has 2 purposes; 1. It keeps dirty oil in the filer after the engine is shut down by preventing flow back-wards. 2. It stops oil in the upper lifter galleys from draining back down the lowest point, the oil pan. This means when you start the vehicle, about 1 qt +/1 has been trapped above the oil filter and will be reaching the lifters a second or 2 sooner than it would if it was all down in the pan. Result, quieter engines. Noisy lifters at start up can almost always be helped by using a filter with a ADBV.
Does it hurt anything, NO. Quality filters will have these as well as oil by-pass valves. They are there as a extra measure of protection for uninterrupted oil flow to the engine and to protect the engine should the filterer become restricted etc. Whats more important, ensuring oil flow or filtering all oil at the expense of losing an engine from restriction in the filter.
[ October 12, 2003, 01:41 PM: Message edited by: Mike ]
It has 2 purposes; 1. It keeps dirty oil in the filer after the engine is shut down by preventing flow back-wards. 2. It stops oil in the upper lifter galleys from draining back down the lowest point, the oil pan. This means when you start the vehicle, about 1 qt +/1 has been trapped above the oil filter and will be reaching the lifters a second or 2 sooner than it would if it was all down in the pan. Result, quieter engines. Noisy lifters at start up can almost always be helped by using a filter with a ADBV.
Does it hurt anything, NO. Quality filters will have these as well as oil by-pass valves. They are there as a extra measure of protection for uninterrupted oil flow to the engine and to protect the engine should the filterer become restricted etc. Whats more important, ensuring oil flow or filtering all oil at the expense of losing an engine from restriction in the filter.
[ October 12, 2003, 01:41 PM: Message edited by: Mike ]