Re: [DML] Re: oil filters

[dherv10@xxxx]

Dan, Let me explain why the anti-drain back valve filter or check valve as 
you call it is so important in the Bosch oil filter and other applications. I 
think you will better understand after this. Oil filters made for specific ( 
applications ) as in the De Lorean, we are a selected few. 
If your oil filter is pointing down like in most cars, then the filter is 
full of oil all the time, So when you start the car the filter doesn't have 
to fill up before oiling your engine. 
The De Lorean filter is mounted on the side of the engine and without the 
anti-drainback for check valve filter, you will be starting the car without 
oil in the filter so it will have to fill up the filter 1st before oil goes 
to the engine. Without the anti-drainback valve you will promote more wear to 
the engine because the filter won't hold oil because it will drain back to 
the level of the car and lubrication will be slower. 
If your running the recommended weight oil 20/50 or 20/40 I would want the 
oil there all the time to promote no wear during start up. This is also why 
PTE/Teflon was added to oil to help lessen the friction of metal from metal 
during that critical time of start up and running. 
This is like the fuel accumulator holding pressure in the gas system of the 
De Lorean. Without the constant pressure on the fuel system, then the cars 
would be harder to start. This also why you don't pump the gas pedal when 
starting the De Lorean.
Sending units are cheap compared to the engine and I can't see companies 
spending millions of dollars designing an oil filter to such high specs just 
to hurt the engine.
I will stick with Bosch, and other companies that make filters for the 
specific application. Anybody can roll up paper and put it in a screw on can 
and call it an oil filter and in certain applications it will work. Hey. Les. 
Remember the old days of oil filters. I hope this helps how important the oil 
filter is to the life of the engine.
John Hervey
www.specialTauto.com