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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHM96 ENGINE PRODUCTION MODS
Leading reported evidence
Replace oil frequently
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that contain suggestions
1
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Suggestion
If the car sits for months on end without being used and you have neglected to change the oil frequently then you should be afraid.
Leading evidence: 'Replace oil frequently' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace oil frequently' (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.
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5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
In 2008, my '03 C4S suffered an IMS failure.
It had a new, factory Porsche engine installed in 10/08....#M9603AT665XXXXX.
In reading A. Streather's tome on the 996, this engine seems to have had all the mods made.
RMS triple seal
Larger IMS bolt
Larger IMS bearing
I would appreciate comments on this engine to help me sleep better.
I love the car, and it feels strong and athletic.
Joe Lapin
What comments would you appreciate?
Being serious, if the engine was installed in 2008 I do agree with you that you have the larger IMS bearing.
I would also agree that you have the best RMS seal. I don't believe it is a triple seal, whatever that means. What the seal was made of tends to have created the fix. The new seal is made of PTFE and does seem to help with future RMS leaks.
The IMS bearing is bigger but that didn't stop all the problems with failing engines. That bearing is so big that it can not be removed from the engine unless you split the engine case. That is the bad part.
If you owned the car when the engine was replaced, and you followed the break in procedure for the engine, and you change the oil religiously every 5K miles OR 6 months (both mileage and time count) with a good quality synthetic, you should have many years of enjoyable driving without issue.
If the car sits for months on end without being used and you have neglected to change the oil frequently then you should be afraid.
Otherwise.....enjoy!
Joe I too have just purchased a reman M9603AT66565897, and I can take a picture of the IMS externally as its in my garage awaiting install if you'd like. IMS is definitely improved mine was purchased in 2010
Thanks for all your comments.
I am sleeping well, and blasting around in the 996. What a dream to cruise in. We recently spent a weekend in Ottawa, and it was comfy and smooth.
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