VW OEM oil filters or aftermarket

[unDummy]

I'm not saying that I wouldn't run without an oil filter. I'm not going to worry about the non trivial bypass PSI. Even in bypass, an oil filter is filtering.

Wasn't there a thread with a UOA withOUT a filter with good wear PPMs? or what about the useless appendage theory? Use the search feature.

My engine needs oil flow and pressure. I'd rather have the OIL FLOW and PRESSURE to reduce or eliminate any potential wear. I DON'T want my oil to be RESTRICTED by a poorly flowing filter with an overly high BPV.

Prove THIS yourself. Run your engine with NO filter. See if it fails. Then, run it with NO oil. How long will it last?

lower bypass PSI=less oil restriction=more lubrication(flow&PSI)=less wear=less need for filtration

My car has an 80PSI oil pump(volume unknown).
80psi regulator less 10psi filter restriction = 70PSI for the engine and is close to what I've measured
80psi less 30psi from a fancy German oil filter = 50psi in the engine

Which filter do you want in your engine?

With a high BPV oil filter, I'd need a higher volume oil pump with a higher PSI regulator to match the performance of the stock pump/regulator with a filter with a lower BPV. Not worth the investment for a so-called improvement in filtration that won't be seen.

And for those that believe in the thicker is better theory:
Oil flow also is needed for cooling.
Less oil flow=less cooling=hotter temps at contact points=hotter oil=thinner oil=thinner oil film=more wear

And, the oil pump PSI regulator dumps oil earlier when having more restriction downstream. So, not only is there a risk for less PSI in the motor, but flow is reduced since the oil pump regulator is dumping earlier reducing oil flow.

If you have room for the L40316, consider using the L40017.

 

[Gary Allan]

I don't think the higher bypass setting has an impact until you diverge from the life limits of the lesser bypass setting filter. That is, in the onset of use, the PSID between an OEM filter with a 30 (or higher) bypass setting, and a filter with a 8-16 bypass setting are probably nearly the same. Both probably see around 2psi. Even if you doubled it for a finer media ..it still wouldn't hit either of the settings.

That means, in most common instances (I don't have experience with filters @ WOT @ 6500 rpm), we're talking strictly in terms of filter "loading". Since the engine is not changed by the installation of a 30 psid bypass or a 16 psid filter ..we can assume that they will, more or less accumulate the same material over like miles (with minor variations). Therefore, we can reason that a filter with a 8-11 psid ..that hasn't reached 8 PSID will be filtering 100% of the oil ..and so will a 30 psid bypass filter that is at the same point in its life. It too should be @ 7-8 PSID and will be filtering the exact same 100% oil flow ..and have the same upstream impact on the oil pump's pressure relief.

 

[audi_guy]

UD,

My apologies if I offended you. That wasn't my intent.

You make some valid augments. I'm not advocating the use of oil filters with bypass valves that exceeds the manufacturer's specifications. My point is that I don't want the oil filter in bypass until it's necessary and not before. In my auto, which by the way does have a 1.8t engine, I'm going to use the recommended oil filter – yeah the fancy German filters cause they cost the same as the US ones and I trust the quality and that they meet the specs needed. Since I'm fimilar with the 1.8t engine I was warning Craig of potential problems with not using the correct oil filter. Both or you may use what ever oil filter you wish in your autos. That's your prerogative.

I did a quick check of the at Purolator web site. The recommended filter for the 1997 Jetta with 2.0 engine has a bypass valve pressure of 25-35 psi. That's right up there with the MANN's recommend filter's bpv pressure of 2.5 bar. In that case other than the flow issue and possible media collapse, I don't see any reason why not to use the Purolator filter. It may be a Mann filter anyway. The Purolator L40316 sure is a Mann.

Regards,

a_g

 

[baomo]

i use mann filters on my '97 2.0.

mahle's pretty good too.

 

[unDummy]

Even when there is bypass, there is flow through the media. Its the excess flow that causes the bypass to open. I'm one that prefers lower bypass pressures and really don't worry about MFG specs when used in comparisons.
Get the oil flow into the engine where its needed to lubricate.
More lubrication=less wear=less need for a filter

 

[audi_guy]

quote:

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consider using the L40017

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BTW: This filter has a bypass valve pressure of 8-11 psi (per Purolator's web site). IMHO this is not suitable for use in the Audi/VW 1.8t engine. If someone, i.e. VW/Audi AG engineer, can state otherwise, I would not use this filter or any other filter without the correct bpv spec in that engine.