Originally Posted By: walk23
Amsoil, RP, Micro Green
None of those are cheaper. You advised to use a cheaper filter and change it more frequently, then stated that there are better filters than the M1. So what filter is less expensive and better?
Or were you attempting to make those two items mutually exclusive?
And if that is the case, then what is the logic in advising somebody to use a less expensive filter, but then stating there are better quality filters than the one in question, but cost more? The latter point is irrelevant if you are advising the use of an inexpensive filter. And the prior point is irrelevant if somebody is using a "money is no object" approach to filter purchasing. Yet you are touching on both in the same statement.
Do you just happen to have a personal bias against the M1 filter perhaps?
The only filter I can think of that has a higher filtration rate and is less expensive (for folks in the US, not Canadians) is the PureONE. And it has a lighter-weight can and dome-end bypass, whilst the M1 has a very heavy can and in a great number of applications, a threaded-end bypass. Making it a "better" constructed filter.
Now of course what I'm inferring from your post is that the glass-media filters are superior to traditional filter media and synthetic blend media found in filters like the K&N, Mobil 1, and PureONE.
On this point I tend to generally agree. Glass media is more dense and so has a higher contaminant capacity. Donaldson's pioneering of this technology has opened the door for a reasonably long list of filter manufacturers using this technology, most of which were not mentioned in your post.
However, just because a filter has synthetic glass media doesn't mean it is a "better" filter:
The RP is 99% efficient @ 25 microns
The Mobil 1 is 99.2% efficient at 15 microns
The AMSOIL is 98.7% efficient at 15 microns
No info that I could find on the Micro Green, which seems to function something like a mini version of the Fleetguard Venturi filter, which has a built-in bypass filter, where some of the oil is filtered down to the (in the case of the Micro Green) 2-micron level. However, they don't say how efficient their full-flow media is in multi-pass efficiency (unless I missed it) so I'm not sure it can be readily compared to the others in question.
So, going by the above list, the Mobil 1 is the most efficient filter of the bunch, whilst the AMSOIL likely has a higher contaminant holding capacity. One would be better for drains up to say 15,000 miles, the other up to say 25,000 miles.... Which corresponds with their manufacturer's mileage recommendations.
