Whether or not a filter has an anti-drainback valve has more to do with
the specifications of the engine manufacturer than the "quality" of the
filter.
Engines designed to require an anti-drainback valve should be fitted
with this type of filter and vice-versa.
Quality filter manufacturers will specify for each model whether or not
the valve is present.
While I am on the subject, many engines demand filters with bypass
valves; it's important not only to use a filter with a bypass valve in
these applications, but also to pay attention to the PSI setting for the
valve to be sure it is within engine manufacturer tolerance. Putting a
filter with a 20psi valve on an engine that requires a 7psi valve can
lead to damage. By the same token, some engines have internal bypass
passages and valves and require filters without this feature.
Bottom line here is that just because a filter will thread on to the
post and has a matching gasket OD does not mean it is correct for the
application, and in fact it can cause damage. I am dismayed to find
"cross-reference" lists put together by amateurs that often list filters
with incorrect specs as being compatible with OEM filters.
Reputable filter houses such as Baldwin, Fleetgard, and Wix all have
charts that specify valid cross-references for actual OEM-spec filters.
-Sean
m/y Vector
Lying Matagorda Bay, TX
http://Ourdyssey.BlogSpot.com
On 05/18/2017 06:26 PM, Richard P via Trawlers-and-Trawlering wrote:
I thought that the better oil filters were made with a one-way valve so
that oil could not drain out. Are people confident that punching a hole in
an upside down filter will let it drain?
Whether or not a filter has an anti-drainback valve has more to do with
the specifications of the engine manufacturer than the "quality" of the
filter.
Engines designed to require an anti-drainback valve should be fitted
with this type of filter and vice-versa.
Quality filter manufacturers will specify for each model whether or not
the valve is present.
While I am on the subject, many engines demand filters with bypass
valves; it's important not only to use a filter with a bypass valve in
these applications, but also to pay attention to the PSI setting for the
valve to be sure it is within engine manufacturer tolerance. Putting a
filter with a 20psi valve on an engine that requires a 7psi valve can
lead to damage. By the same token, some engines have internal bypass
passages and valves and require filters without this feature.
Bottom line here is that just because a filter will thread on to the
post and has a matching gasket OD does not mean it is correct for the
application, and in fact it can cause damage. I am dismayed to find
"cross-reference" lists put together by amateurs that often list filters
with incorrect specs as being compatible with OEM filters.
Reputable filter houses such as Baldwin, Fleetgard, and Wix all have
charts that specify valid cross-references for actual OEM-spec filters.
-Sean
m/y Vector
Lying Matagorda Bay, TX
http://Ourdyssey.BlogSpot.com
On 05/18/2017 06:26 PM, Richard P via Trawlers-and-Trawlering wrote:
> I thought that the better oil filters were made with a one-way valve so
> that oil could not drain out. Are people confident that punching a hole in
> an upside down filter will let it drain?
