"Am I reading correctly here, it takes more pressure to activate the by-pass valve?" Yes you are.. The bypass valve is there to prevent oil starvation if the filter becomes clogged..

So I deduce, it will take more pressure ( compared to Mahle OC-54) to push the oil thru the filter, correct:confused: ergo a "restricted flow" liken to a crushed oil line causing higher oil temps?

Oh wait By-Pass valve is a safety valve from what you are saying correct?

How about the flow data?

"Oh wait By-Pass valve is a safety valve from what you are saying correct?" Yes, that is correct.. The max flow rate is a bit more with Wix filter.. Micron filtering is a bit better with the Wix also.. Based on the comparison information, the Wix filter could be considered a bit better filter.. In the real world, I don't think the stats would really make any difference or sway me to use one filter versus the other..
Back to your original question.. I see no logical reason for either of these filters to affect your oil temps.. Sometimes we have to careful not to start chasing ghosts..;)
Now, if you have a restricted (partly crushed, dented?)oil line, yes that could affect oil temps.. This is a common problem on P-Cars where some moron has put a jack under the oil lines.. This problem would show up regardless of which filter or oil that you use.. So I would throw that out of the discussion on oil filters..

I agree with this statement 100%.

Thanks Porf Neel,

The only changes were the Brand of Oil and Oil Filter. Oil Lines have not been damaged.

Well, I will see if the Mahle Filter effects oil temps.

Thanks to all, even the sarcastic ones, I'll Pray for You ;-)

From the many threads I have read about oil related features, I have learned the following.

One person changes to a certain oil and his engine gets hotter. Another changes to the same oil and it gets cooler. Same oil causes a leak in one car after the change, but it stopped a leak in another car. A certain tranny oil made one car shift better, another car shift worse. Changing from X to Y completely transformed one car, changing from Y to X transformed another.

Clearly, from the evidence, our cars are fickle.

Most people recommend oil with ZDDP and Mahle filters. I am sure someone will soon post that they changed to that combo and the engine blew up, but I am sticking to it anyway.

+1 Daniel...

Question--->

Oil pumps are typically gear-on-gear devices....so they are considered "positive displacement" pumps, right? So....a "small" incremental increase in restriction , say, with a higher setting of the oil filter's by-pass valve.....will have NO affect on oil FLOW....correct? It will imoact residual pressures in the oil line system, but this is not like throttling (say) a centrifugal pump, with an altered pressure/flow operating point, if pinched.

Right?

I do agree that our cars are a bit fickle but I am trying to understand the oil temp change and why it occurred.

Weather report states tomorrow will be 75+ degrees so I will take the same route at speed for 20 minutes to see if temps rise or stay at normal operating temps as designed.

BTTT, for Nick.....

Unfortunately, temps only reached 69 today, not hot enough to tell if the Mahle filter runs same oil temps or not.

But I still took the top off and enjoyed the ride :D

Well, 75 degrees on same Freeway no traffic temps are good on the guage:

http://img.photobucket.com/albums/v5...207_124922.jpg

Need to wait for hotter ambient temps to really see if the oil temps maintain at proper levels