Posted: Oct 13 2004 at 1:12am | IP Logged
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Just about all good filters have "check valves"... and also pressure relief valves so that in case your filter would plug for some reason the engine oil would keep flowing... better unfiltered oil than none! The dealer just wants you to buy theirs...
I'm going to use an Amsoil filter and 100% synthetic Amsoil on this next change (around 6000 mi). Amsoil filters have better capacity (dirt holding power) and better filtering (down to 10 or 15 microns I believe).
Using Amsoil synthetic oils and filters I was doing 7,000 to 10,000 mile oil changes on my Nissan HardBody SEV6... it has 250+K on it and is still going srtong with little signs of slowing down anytime soon!... although my Titan gets driven much more these days!
If you use the Amsoil bypass oil filtration system that filters down to 1 micron they recommend oil changes every 100,000 miles! Basically synthetics do not wear out like petroleum based oils, it's the dirt that must be dealt with. Syntheti'c are much better at handling temperatures... Why do you think that jet engines run on synthetic's... because petroleum oils cook!
Just FYI Amsoil recommends 7,500 mile oil change intervals using their products. As I have said before in regards to these products, I'm no salesman, just a believer...
CJS
__________________ CJS
http://www.racemtbikes.com
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