Hi, I have a 2006 Nissan Patrol, with the 4.2TDi diesel motor. Normally I use Z503 oil filters. However I have a couple of Z9 oil filters sitting in a cupboard. They have the same thread as the Z503's & both types have an anti drain back valve, so I am wondering if there is any reason I should not use the two Z9's on my next oil change? I would welcome your advice on this.
Thanks,

Hello Cuppa

Thank you for your enquiry. The two filters while looking similar we do not recommend as directly interchangeable as they have different internal valving. The Z503 only has anti-drain back valve whereas the Z9 has the anti-drain back valve and a relief valve. Our recommendations are designed to ensure that the filter works to it maximum specification and performance for that particular application. We recommend you use the correct filter for your vehicle to ensure that you have the maximum coverage of our warranty in the event you were to experience any problems. Hope this information is useful.

Regards Ryco Customer Service
Elsewhere I read a response to the same question from Ryco which said you could use the Z9 in place of the Z503 but not the other way around,....... but do so at your own risk, our warrant wont cover you.

Cuppa