When I got my 1997 XJ6 last year I had my mechanic change the fluids, but this year I decided to do it myself. I ordered a Jaguar branded EBC 9658 and removed the old filter which was a Purolator One PL15317. I checked both filters carefully and they are recommended for my car.
To my surprise, the Purolator was much smaller in diameter than the Jag filter. The Purolator is only slightly larger than the sealing ring, while the Jag brand is 1/2 again as large. So much so, I had to measure the rings to see they were the same size as I wondered if I had ordered the correct filter.
I am far from an expert on oil filters but it seems logical the larger filter is going to do a better job or last longer? The only reason I can think of for the smaller one is ease of installation..
If anyone has any thoughts on this I would be interested to know if filter size/capacity has any quality effects on the job it does? In any case, think I willl stick with the Jag brand in the future.

 

There was brand that skipped putting in the inside perforated metal backing of the paper filter causing drop in oil pressure and problems with the engines . Can't remember the brand .

 

It's fair bet that actual size is one of several factors that can influence filter effectiveness....and probably also a fair bet that bigger doesn't always mean better. There's number of pleats, the filtering material itself....probably other things as well.

How much tangible, real-world, "I need to worry about this" difference? I'm guessing none.

Others will chime in; everyone has their own opinions and favorites

Cheers
DD

 

The main issues are return valve (or not) and regular filter changes.
A few years ago my mechanic put a Fram filter on my car. Every morning on start-up, the big ends would rumble for a few seconds before pressure came up. I can only assume it had no non -return valve, and the oil pump had to fill up the filter every start-up. I phoned him after about two weeks nd he said he’d put it on to save $ because the genuine Jag filter was about $10 more expensive. I got him to get in 6 Jag filters for me, put one on the car. Problem solved immediately.
I think any good quality filter is fine, but I stick to the genuine parts as it is an area not worth penny-pinching for me

 

Where I am a genuine filter from the dealer was about $10 cheaper than a Fram, so it was an easy choice. I've actually had good luck using Motorcraft filters off RockAuto.

 

Just to add to this discussion, for many years, Mann and Mahle have been primary Jaguar oil filter OEMs. Jaguar used the same size filter on many models from the 1976 XJ and XJ-S to the X350, S-Type and XF.

Mann W 719/7 and Mahle OC 238 have non-return and high-pressure bypass valves and are widely available through auto parts stores and online at Rock Auto and elsewhere. Later during Ford's ownership, Valeo became a Jaguar oil filter OEM, but to my knowledge Valeo filters are not available to the U.S. aftermarket.

Cheers,

Don

 

Don, my memory is a bit too foggy to be 100% certain....but if 97% is tolerable it seems to be that once upon a time Jaguar V12s used a longer filter. The latest iteration, the erstwhile EBC9658, replaced all previous numbers and sizes.

Cheers
DD

 

Doug,

Somehow while editing my message for brevity I deleted the phrase "on many models." Thanks to your sharp eye I have added it back!

The Mann and Mahle filters I noted in my previous post are said to fit the XJ12 from 1976 to 1996, but they were probably not the original equipment. I know that V12 E-Types used cartridge-style filters but many owners converted them to spin-on filters.

Cheers,

Don