RotoRocket

iTrader: (1)

I've always used Purolator PureONE oil filters because the OEM Denso/Nippon have been and are increasingly hard to find (the genuine ones - not the knock off ones that some vendors who many here know of have been selling lately, which is some pathetic bullshit, in my humble opinion).

Also, the PureONEs have excellent filter media material, lots of pleats, are well constructed, and have a well designed silicone ADBV, which is all the more important given the location and direction of the mounting of the oil filter.

At any rate, even though 'the book' and many online "will it fit?" tools claim that the Purolator PL14610 PureONE does not fit the Series I, it actually does, being 3.25" inches tall versus the 2.75" tall one that is the Purolator PL14612 PureONE that is specified.

There's no reason not to go with the larger filter, even if you do 3,000 mile OIC as I do, since they are the same price.

Rx8vsMalibu

I use a wix standard size filter. Does the bigger filter make it easier or harder to install/take off? It's always a pain removing the oil filter upside down and so close to the firewall.

RotoRocket

iTrader: (1)

I find that it's easier since the top of the canister is closer to you, essentially.

shr3da

I do, I use series 2 oil filter

Spin9k

There's more to a filter than the size and amount of pleats and will it fit on the threads. Just saying.....

jasonrxeight

no reason to use a bigger one since you only changing oil every 3000-4000 miles.
bigger isnt always better.
I would take better filtration filters over bigger ones.

9krpmrx8

iTrader: (46)

Usually I use the Purolator S2 filters or the stock Mazda S2 filters on my S1 but recently a sponsor gave me a few Denso and K&N filters so I will try them next. The bypass valve rating is also important to a degree. i have found that some manufactures list the same filters for Series S1 and Series II's RX-8's so people should double check. But honestly, if you change your oil and filter often enough it should not make a huge difference what brand/size you use.

RotoRocket

iTrader: (1)

I agree that it's probably overkill, but the filter is the same exact design. If the larger one has more filter media, and costs the same, why not use it?

Spin - You're not implying the PureONE isn't a very good filter, are you?

RotoRocket

iTrader: (1)

I genuinely believe the bypass filter and ADBV are the most under-appreciated aspects of an oil filter.

Spin9k

No idea about any particular filter other than what I've read on the internet. What I was saying is:

- Filter ability to stop a particle size impurity in the oil does not equate to filter size or brand - but depends on the specs of the filtering media itself
- The filter restriction to the oil flow overall does not necessarily equate to filter size either but again to the size/type of filtering media and filter internal construction
- Bypass pressure is important - it should be equal to OEM pressure (s1 and S2 are different for example)
- a cheaper filter that works otherwise may simply not last as long due to lower quality/less filtering than the OEM. IOW filters get dirty and stop doing what they are supposed to do and then just bypass

Of course a 3rd party filter can meet the specs and be better than OEM ability, but only lab testing can determine whether that is the case.

Galen Darkmoon

Cuz there is no need if ya car is properly maintained, no room for one in mine anyways.

monchie

I only use the ones made for my car only. Rather be safe than sorry.

ken-x8

That's been my policy since 1986, when I went hunting for a filter for my wife's new Accord. Two auto parts stores, two filters, neither one fit. Then I found that OEM filters at a dealer cost about the same as name brand generic filters. And most dealers give a discount if you buy four or six or ten or something like that.

There's a member here who has expertise in filters...feel bad I don't remember his name, because his posts on this topic were great. He cut open a bunch of filters, and did not find any for the RX-8 that were better than OEM. As I recall, he found that the premium line of the name brands were kind of OK, but the basic ones were junk.

Ken

NotAPreppie

I go with the bigger filter size of a given brand/model as that should increase the surface area of filtration media and reduce the pressure drop across the filter. Admittedly, the difference is probably barely measurable, even with sophisticated instruments. Still, it makes me feel better.

The relief valve for the PL14610 and PL14612 are both rated at 14-18 PSI, so there's no difference there. Also, both (presumably) use the same filtration media, so again, only difference is volume.
(PL14610 and PL14612

In my B5 VW days, we used the biggest damned filter we could fit in order to try to increase overall oil capacity. VW fitted a 4qt sump to a turbocharged engine and it was theorized by a tribologist/lube specialist that this was causing rapid deterioration of the oil and led to the sludging and coking issues common on those cars. More oil means each oil molecule gets heated fewer times per drain cycle.