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Discussion summary
YOUR RESEARCHs oil cooler on a non s? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Replace wp, low temp thermo, flushed coolant
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
Discussions
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1
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Performed · outcome unconfirmed
I replaced WP, low temp thermo, Flushed coolant and replace with Pink.
s oil cooler on a non s? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'Replace wp, low temp thermo, flushed coolant' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check on it by looking at the existing cooler' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
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Suggestion
Yours should not be that way, but you can easily check on it by looking at the existing cooler.
s oil cooler on a non s? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Clean & pressure
Suggestion or failed attempt
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Unsuccessful attempts
1
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Discussions that contain suggestions
1
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Suggestion
I would have any used, unknown cooler ultrasonicly cleaned & pressure tested before installing with new O-rings.
s oil cooler on a non s? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace 'o' rings
Suggestion or failed attempt
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Suggestion
During my Coolant work I did go ahead and replace the 'O' rings for the cooler.
s oil cooler on a non s? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace thermostat
Suggestion or failed attempt
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Suggestion · Original poster
He said it makes more sense to change the thermostat to one that makes the fans kick in earlier, to help the engine and oil stay cooler, since the oil cooler has water coolant passing through it.
s oil cooler on a non s? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace thermostat
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
He said it makes more sense to change the thermostat to one that makes the fans kick in earlier, to help the engine and oil stay cooler, since the oil cooler has water coolant passing through it.
s oil cooler on a non s? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run from the top of the cooler
No successful repair reported for this finding.
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Suggestion
Only the very earliest 2.5L cars (1997 and early 1998) had an odd ball setup that used and adaptor plate between the oil cooler and the engine, and these also lack the small upper return line running from the top of the cooler to your surge tank in the trunk.
s oil cooler on a non s? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
20 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T052503Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I was considering doing a 986 s oil cooler on my base 986, but my mechanic told me he can't see there being much benefit in doing it on a 2.5 car. He said it makes more sense to change the thermostat to one that makes the fans kick in earlier, to help the engine and oil stay cooler, since the oil cooler has water coolant passing through it. Any opinions? Does anyone think that a bigger oil cooler on a base model still help cool oil better?
Ignore your mechanic and install the S oil cooler. Even without the low temp stat, the S oil cooler has nearly twice the surface area for shedding heat to the coolant, which will lower your oils normal operating temps, improving the oil's life expectancy. Adding the low temp stat makes it that much better. These are two of the best low cost mods you can do for the car.
So along those lines.
I replaced WP, low temp thermo, Flushed coolant and replace with Pink.
Last weekend I finally got to drive for several hours.
Using the Torque app:
I was seeing temps 10- 20 degrees cooler (Outside temps were in low 40's)
On the Hwy (1/2 hour at 75-80 mph) I use to see rock steady 193 degrees
I was now seeing rock solid 174 degrees
The gauge was always above the 180 mark, now it was running a bit under the 180 mark
Driving stop and go, low speeds, lots of shifting, higher RPMs - mid 180s
At stops, it would creep into low 190s. As soon as I started again back to mid 180s
It will be interesting to see how the temps behave when it 90s outside
If I had to get the S cooler, is there a specific year that will fit my car? Mine I a 99 model. I heard that some cars had a slightly different cooler than others.
Only the very earliest 2.5L cars (1997 and early 1998) had an odd ball setup that used and adaptor plate between the oil cooler and the engine, and these also lack the small upper return line running from the top of the cooler to your surge tank in the trunk. Yours should not be that way, but you can easily check on it by looking at the existing cooler.
I just added a 'S' oil cooler to my base 2000 model this winter per JFP's recommendation. I can't wait to reap the benefits.
I am already running the low temp stat since my last water pump swap/maintenance three years ago.
Do you know the part number for the oil cooler? I found a behr/ hella model number 8MO376726-111 and it says its for Porsche part number 99610702557/1. Is this the right one please? Will it have same o rings as on the base model? Can I use my o rings with it or would they have to be new? Reason I'm asking is that the shop that has the oil cooler doesn't stock the o rings.
Latest part number I have is 996-107-025-59 (retails for around $280) for the cooler. And
never
reuse the four O-rings, you will end up with leaks. We also have never used aftermarket versions of this cooler, only the OEM.
The 99610702557/1 part number is a discontinued item.
And be careful buying a used OEM as it may have metal particles in it from an IMS failure or some other engine catastrophe where metal particles are released.
so i bought the larger S cooler, but i have a problem, it wont fit. the reason being that i had enlarged the air intake hose, and the larger hose rests on the original oil cooler. if i install the larger oil cooler, the intake hose will be lifted up and then the engine cover wont close. stupid me i didnt check this before i bought the oil cooler. now i have a brand new larger oil cooler that i cant use, unless i fit the original intake hose, which i dont really want to do since i also have the enlarged throttle body and pedro's intake plenum!
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