Originally Posted By: skyship
Originally Posted By: Brenden
Which is why I grab a purolator usually, you just cant beat 99.9% at 20 microns and $5 a can with out a rebate...
OH dear, thats not really true, as the advertising folks only quote the final filtration efficiency just before the filter blocks. You need to know the initial filtration efficiency, which might be around 96.9%, as thats the real killer when the oil filter is new.
If you are a real smart Alec then get to know the boys in the Iffy lube shop and buy a used manufacturers oil filter that some dipstick dumped for a made in China or Mexico orange can of death because of a 3K OCI sticker stuck under his nose. Drain it overnight and wipe instant gasket on the seal before fitting as a precaution.
Dirty filters are much better than new ones right up until they block. I don't chance it with oil filters as the locals do very long OCI's, BUT I never fit a new air filter as they are a nightmare in performance terms.
Always keep a cabin air filter clean or it reduces air flow for demisting unless you get hay fever, but change engine and fuel filters on condition only.
Remember the green filter users motto, "If it ain't real black, put it back!", BUT don't exceed the manufacturers recommended oil filter change interval if you have a horrible screw on type that can't be inspected.
1. Link to that info please.
2. Lol, a new one may let slightly more dirt in, but it won't have a detrimental effect on engine life; the only thing you will notice is the mpg increase from a fresh filter if the old one is bad.