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i have seen this in other places as well, supercheap to be exact, but it's what it says in the ryco booklet.

they say for the RB25DE(T) to have a Z442 or something if it's made after '98. and it is that much smaller (smaller than the one for my house-mates 2.2L camry engine).

now, i only have a R33, so i would be saying stick with the Z145A, which is what i use. and i would say that you should use the same for the R34 as well.

a larger filter should have a higher flow than a smaller one (based on larger cross-section of filter). so i would say that maybe the Z442 or whatever is more expensive and they are trying to get money out of you, or the guy just doesn't know what he's on about. but if anyone else can have some logic over why a smaller one would be better, i would like to hear it.

Hey mate,

I use a Z442 on my R34 RB25DET, Here in New Zealand the recommended filter for most rb's are the Z101 but the Z101 doesnt fit on the 25 on the 34's I cant remember exactally what it is but it hits on something so the smaller filter is perfect.

Dunno what the difference is but I would go for the one that's specific to your vehicle model why risk using something else?

RB30, RB20, RB26, RB26 all can use the Z145A oil filter.

Its a 3/4 thread oil filter.

The Z442 is the same kind of 3/4 oil filter but smaller, I use the Z442 on my R33 because I have an adapter that goes to the oil cooler, therefore a Z145A does not fit in there.

I would assume the larger oil filter is preferable...

the 34's use a slightly different filter cos there is something down there that fouls on some models

if its a 33, stick with the bigger filter, if its a 34, you can try a 33 filter and if it clears then use it cos they are cheaper and bigger = more surface area and flow/restriction

i've got a stagea with the neo motor and 4wd shiz and i've got the 33 filter on it

the 33 filter is also cheaper too

exactly what i was going to say, larger area means either more flow (which means less pressure is required to force the oil through the filter) or more filtration potential for the filter, or most likely a combination of the two.

interesting that they both fit. the bigger one has the potential to be better filter but as said above there may be situations where it doesn't work on the car.

i was given one of the bigger ones by someone who didn't know what he was doing at nissan (urgh) but it worked fine. sump plug washer i bought was way too big tho

  • 4 weeks later...
Ah I'm an idiot.

I use Z145a's on my 25 neo (in R32)

i know this is a bit late but it doesn't matter

both filters have the same dimensions on the face of the filter, the body is just a bit bigger on the 33 one which can foul on some 34 motors (but haven't heard of anyone having troubles)

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