Oil filters for GU patrol

Nissan in their wisdom, changed 1/2 way through the GU range to 2 different filters from the 2 the same thing. They went back to 2 the same after a while. Good eh!

The 2 the same are only $10ea.. the others are $$$.. :(

G'day Austravel,
You must have one of the first 4.2 turbos (1999 model perhaps?).
They'd certainly changed over to 2 different filters (added a bypass filter) by the time mine was manufactured in June 2000.
Not sure about your reasoning on oil light going off sooner. I would think that the better the filter, the longer it would take (nanno seconds admittedly) to build up pressure at the switch (which is on the "downstream" side of the filters). My reason for saying this is that the filters obviously have a inherent restriction factor on the oil flow and thus the more filtering that is being done, the more restriction to overcome, the longer it would take for the pressure to build up and switch the light off. It follows (in my mind at least) that if you ran the motor with absolutely no restriction in the filters (by pulling the guts out of them), the pressure at the switch would instantly build and the light would go off.
No doubt there are more mechanically-minded people out there who will shoot me down in flames; I don't mind at all.............go for it. I'm always open to learning new stuff.

Dont some have a non return valve to stop loss of oil when switched off?
And to ensure the motor gets oil quick after cold starts? Valvoline is a big name in oil so wouldnt think they would make a dud!

You definitely have to check the Ryco catalogue carefully against the year with these.
My 1999 GU 4.2 takes the Z416 and 503 filters, don't know the Valvoline equivalent.
Cheers, Mark.

This may help you somewhat. I've been through the filter wringer on this one before.As with most genuine parts, most are produced by an outside company and sub-contract to Nissan or whomever. Nissan simply buy in filters from another manufacturer and have their own part number etc printed. If you cross-reference with Ryco (via their very good web site) you will see that the Z416 (the one with the larger thread and hole, retails around the $13 to $15 mark. The other one,I think is Z506 or whatever, can be interchanged with a Z9. The Z9 is the most common and therefore the most cheapest filter on the market. Try $2.90 on special. (makers like Valvoline,Cooper,Purolator) the USA makes are good quality. Steer clear of the Chinese crap. These will keep the oil light on longer due to the oil draining back overnight. Air in the system (ie light on) also means no pressure at crank and rod bearings. Dicey. Oil light should go out in under 5 seconds. I also found with the Chinese crap that they tended to foul on the casting before contacting the seal too. Sloppy manufactuering. I use Z9 (or equivalent) when on special (Autobarn,Bursons etc) and run the Ryco Z416 for the "expensive" one.

G'Day All

2003 GU 4.2 Td.

I have recently had the pleasure of two oil changes performed by a nissan dealer where the OE filter, yes the blue nissan ones, had faulty anti drainback valves. These two instances were separated by a major (30K) service. At the first rectification by dealer 1 I was told that the oil light should indeed go out fairly quickly at startup. When I pressed them for an exact number I was told around 3 seconds with 5 being acceptable. I had new filters fitted and the problem went away.

About 5 weeks after the 30K service I had another oil change done by dealer number 2. when I came to pick up the car I noticed that it took about 15 or so seconds for the oil light to go out. I went back inside and spoke to the service reception person asking them to get the service manager so I could have a chat with them about it. They came back and said "the workshop foreman says this is normal and not to worry about it". I then mentioned the previous rectification and the dealers name that gave me the preceeding info, asking them who was lying and why they thought so little of the investment I had made on motor vehicles with Nissan. The reply was a bumbling string of backpedaling crap. This is the last straw for dealers as far as I am concerned. I will never take my vehicle to one again. Should you be interested in which dealer did what I am happy to pass on names off list.

The moral of the story is, don't think you're getting good quality equipment just because it has a brand name on it. two sets of nissan filters in four months faulty.

Below is the online discussion (minus names) I had with one of the RYCO techs on the Z503 and Z9 filter. The Z503 is the one they specify as a replacement for the genuine filter for the 4.2 turbo diesel GU. As they say if you do it be it on your own head, neither RYCO nor myself suggest you use the Z9 as an alternative. Read from the bottom up, bottom email is my first etc.

Looks like it might be worth considering.

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The only issue you may have if anything was to go wrong you would not be covered by the Ryco warranty as it states you must use what is catalogued.

We normally bring a filter like this out because it is closer to O.E specifications and we have to keep within the O.E standards..

You could use it but as they say on your head be it.

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Thanks, think I'll do this as the Z9's are much, much cheaper than the Z503's which are listed for my GU 4.2 turbo diesel patrol. Any reason for this, is it just economy's of scale?

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Correct but not the other way around!

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So there should be no reason why I can't use a Z9 filter in place of a Z503 is this right???

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Thanks for the reply. I have a couple more questions leading on from your info.

1. I gather the relief valve is if pressure builds to high it will open. Why doesn't the Z503 have one and is this the correct logic as to it's use?? CORRECT

2. Since the Z9 is larger in physical size does this equate to more filtering capacity ie more filter paper so takes longer to be fully contaminated??? There is not enough difference with these two to make a difference.

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Thanks for the email.
Below is the specifications I believe you are after.
Hope it helps!!
Kind regards

Z503: Thread Seam Diameter Height Seal
3/4 16-UNF-2B 94.00 127.40
70.30 Full flow filter paper is 30Micron No relief valve but
contains an anti drain back valve

Z9:
3/4 16-UNF-2B 94.00 142.00 70.30 Full
flow filter paper is 30Micron Contains both an anti drain back valve
and a pressure relief valve.

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I've been trying to track down specification/data sheets on a couple of filters. The data I'd like are on your filters Z503 and the Z9. Are you able to email me a copy or tell me were I can locate them. Basically after filtration and size specs.