Dirty Oil Filter...Better than New One?

[BobCorazza]

Full flow filters generally are only capable of capturing particles larger than 30-40 microns with any effiency, so with a reasonable condition engine the chances of a full flow filter going into bypass are practically nil for several mfg spec oil changes (ie: filter replacement every other). By the time the filter is (perhaps) performing better filtration it will be sending unfiltered oil through the bypass valve. So... If the filter is in fact dirty (near saturation) it is not better than a new one IMHO.
I know the thread is not about brands or efficency, but I have to add that I have read almost universal poor opinions of Fram's quality and efficency.

 

[gsxr1100]

I have to agree, I would not tell anyone to use Fram. Sorry...I would say use Fleetguard, Amsoil, Pureone, Kubota.

Last time I check, the other day, the oil filter were like $5 each.

I only do my oil once per year no matter the hours; either 30 hours or 300

 

[Egon]

Henro:

I'd suggest that a filter is dirty when it starts to restrict the flow rate it was designed for. Differential pressure across filter is usually the way to tell. If it's a full flow filter with no bypass you find out quickly.

In industrial situations there are often two parallel filters so that they can be changed without halting the process.

Egon

 

[BXMMCC]

If you have a small scale with good resolution, weigh the used filter after you let it drain. Do it again after an extended filter change. Note the difference.