Genuine oil filters

[jock]

Think its the smaller size mesh in the new filter reduces the flow and therefore less oil pressure Like a clogged filter gets bypassed?

[will.i.am.s2]

Ive just bought a Mann oil filter for mine was wondering how hard it is to change? Is there a special method for getting the old one off? It looks awkward at best

[diditno]

The easiest way is to take he front cross member off and Evan the rad forward, but you still need the arms of a 6 year phillipino boy to get in there to change in

[fabulicious]

Lads, if it makes any difference whatsoever ive noticed f-all difference in oil pressures if the dial in the cabin is to be believed when using the filters renault have supplied me in recent years.
If you ask me the oil type would have a greater baring on pressures.

[PC-PLOD]

Changing an oil filter is not difficult extend the grips on an oil filter wrench and its a 10 min job

[sideways danny]

I use genuine. Same filter as a 172/182/225.....every other F block engine. They work perfectly on those, and the engines really aren't much different.

[claireharrison]

Right, just to be clear on this:

I noticed a pressure drop when using a genuine renault filter one day during an oil change. So i checked the part number and saw that the genuine mann filter i had removed had a different part number to the genuine filter i had put on. I put the old filter back on and the pressure went back to normal.

So i phoned renault and their confirmed the old williams oil filter had been superseded by a new non-specific part oil filter that was designed to fit on many different engines. These filters filt on cars from the 1.2s to the diesels to the vans. There is no way these engine all have the same requirements for oil flow and filtration. Renault have done this to save money.

So phoned the manufacturer mann, with both part numbers and they confirmed both the pore size inside the filter and the pressure relief valve were different between the two genuine renault filters (the old one and the new one).

I then email mann for a detailed analysis of the possible effects this could have on an engine and they confirmed that the new filter could create lower oil flow (and hence pressure) due to the nature of the pore size and the release valve. They sent me the details of both filters (pore size and relief valve pressure)

I then emailed as many as 15 manufacturers of oil filters with the pore size and relief valve pressure supplied to me by mann from the old renault filter. Of the responses i got (10 i think) only the champion f136 filter was almost identical. Most of the others were similar to the new genuine renault filter, with a potentially detrimental relief valve pressure and pore size.

So what i did next was buy 7 popular brand oil filters for the clio williams, and i tested them back to back, on the same engine, with the same engine oil using a mechanical gauge. I took 3 reading, calculated a standard deviation and performed a t test to statistically PROVE (to a p value of 0.01) that only the champion filter gave statistically the same oil pressure as the original renault mann filter.

The genuine renault filters physically fit fine and filter the oil, But their internal structure is not as the original filters. Neither are most of the other off the shelf non-genuine items including the pureflux ones from GSF.

Personally i dont care if you read this and ignore it because you think you know best. But as far as i am aware, i am the only person to test, in a scientifically valid way, using proper statistical analysis, the filtering ability of these filters.

Unless you have done the same, your opinion is based on nothing but guesswork and anecdote.

Those of you who are interested, i am glad i could help save the longevity of your engine.

Since i published an article on my findings (probably around 5 years ago) i have had numerous people from many countries contact me to tell me they have followed my advice and returned low oil pressure to normal by changing the filter.

[Jaff]

how much of a diffrence are we talking? pressure wise

[claireharrison]

Mine goes from book pressure, 3.5 bar at 3k at 80 degrees to about 2 bar.

So the new genuine renault filters drop the pressure on my engine about 1.5 bar.

[Jaff]

thats fair enough then. for a second i thought you were being incredibly anal but 1.5 bar is a fair drop in pressure