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Discussion summary
YOUR RESEARCHHighest Milage and What Oil are you using?
Leading reported evidence
Replace every 5,000 miles (8,000km)
Performed · outcome unconfirmed
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0
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0
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1
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1
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Performed · outcome unconfirmed
Minimum 5W40 weight, oil changed every 5,000 miles (8,000km).
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Suggestion · Original poster
Only to later changed to a recommended 60,000 mile trans oil change after a series of vehicles came in for a broken transmission after the original warranty had expired.
Leading evidence: 'Replace every 5,000 miles (8,000km)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Recommend 60,000 mile trans oil' (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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Performed · outcome unconfirmed
For whats it worth, i use a cheaper oil (ELF) but change it every 5000km.
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These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Recommend 60,000 mile trans oil
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
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Suggestion · Original poster
Only to later changed to a recommended 60,000 mile trans oil change after a series of vehicles came in for a broken transmission after the original warranty had expired.
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
Only to later changed to a recommended 60,000 mile trans oil change after a series of vehicles came in for a broken transmission after the original warranty had expired.
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.
45 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello Everyone, I am a newbie with an 2004 C4S. I've been trying to read up on the different types of oils used in 996's. I've read so many different views on what to use ( M1 0w-40, Castrol 5w-40, Motul 5w-40, M1 15w-50, M1 Delvac 5w-40 etc.) I have always said that the "Proof is in the Pudding". Who has the highest milage 996 with original engine and what kind of oil are you using?
I do trust manufacturer recommendation 0w-40. In my previous Mercedes I trusted the manufacturer's recommendation of a sealed system for the transmission. Only to later changed to a recommended 60,000 mile trans oil change after a series of vehicles came in for a broken transmission after the original warranty had expired. I currently have 2 other Mercedes along with this C4s (this being my first Porsche). I've learned my lesson many times before and have traded in to many MBenz and Bimmers due to the manufacturers changing their minds. I want real world numbers. Proof is in the puddin folks. Thank you.
Here we go again - but its my turn to jump in......
Minimum 5W40 weight, oil changed every 5,000 miles (8,000km).
Forget SAE requirements, look for the European ACEA A3/B4 specs - far more stringent than SAE.
I personally us Shell Helix Ultra 5W40, but I believe its difficult to source in the US....
Check out the LN Engineering website for more details,
I follow the manual. 0W40 Mobil 1, and I change every ~10k (occasionally sooner based on circumstances). My oil analysis comes back clear and I have 115k miles on the original engine.
-Shawn
Let me see the manufacturer's recommendation was Mobil 1 0W40 with a 15,000 mile change interval. Well that's one reason I don't follow it, does anyone really agree with a 15,000 mile interval? Also in the manual that came with my car 0W40 is not even listed, but was later in a TSB.
The ZDDP in Mobil 1 was reduced sometime in the last 10 years.
I run Castrol 5W40 in the winter and 5W50 in the summer, change the oil every 3,000-5,000 miles.
I'm at 109K miles on my original engine. I've always used Mobil 1 5W40. I typically change my oil at around 7,500 miles.
I've read about the changes to Mobil 1 over the last decade. I still think it's an excellent motor oil, but it's not the same as it used to be. My independent mechanic now recommends Schaeffer synthetic oils for Porsche vehicles. I haven't used it in the 911 yet, but I am running it in the Cayenne.
My Indy (Porsche mechanic for 30+ yrs) uses ONLY redline as he says the same about Mobil 1. I have been using it on my 996 and previous 986. Great oil
My CTT has 65k miles and according to previous records from owner and now me was using Mobil 1 as well. I might be changing this year to redline on the next oil change
I definitely agree that a 15,000 mile interval for an oil change is crazy. I change my oil in my toyota work truck at 3000 using M1 5w-30 and it comes out so dark. 15k in a high performance sports car is just plain crazy. What about LN Engineering's recommendation of a thicker viscosity oil (I.e. 5w-40) for a healthier IMS? I'm getting pretty good proof from everyone using thicker oils.
more frequent oil changes are more important than the type of oil. I use Motul 5W40 and change it every 5k or 6 months, whichever comes first (looking like 6 months lol)
For those of you that are proponents of shorter change periods, can you please support your assertion with some data? For example, oil analysis results that show unacceptable levels of wear materials or degradation of oil?
-Shawn
For this car 15K or 2 years which ever comes first. Oil analysis after every change. Never had a problem. Oil had 60% of its additives left at every drain.
3K oil changes are an urban myth.
Used liqui-moly 5w-40 on my last oil change. Pelican parts 5 liter jug.
It's $36 per jug.
Car runs fine. No hiccups. Will have it blackstoned in around 5k miles. See what happens.
Btw car has 23k original miles. MY2001 C4 coupe Tip
118k - M1 0-40. ~5-7k. DD. When I opened the engine @ 100k it looked brand new. When I change the oil it still looks golden. Will do oil test on next change.
113k miles, use 0w40 Mobil 1 every 5k miles.
Actually it's even less than that when I DE the car as I will change the oil after each event. Might be overkill but I just feel more comfortable removing the crap that might end up in the engine after tracking it.
135K miles on a 99C4, original engine, had it since 18K in 04 and I never paid any attention to what kind of oil goes in. The invoices from my Indy says Mobil 1.
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