10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHIntermix Issue
Reported or suspected cause
cracked head(s)
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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 report identifying a cause
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.
Reported cause · Original poster
Have a 99' 996 C4 with the dreaded intemix issue which most likely is due to a cracked head(s).
Leading evidence: 'cracked head(s)' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'cracked head(s)' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace coolant and oil i've noticed less of an intermix' (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 report identifying a cause
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.
Replace coolant and oil i've noticed less of an intermix
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
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
Since changing the coolant and oil I've noticed less of an intermix.
Replace oil cooler since it's the original and hope
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
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
Planning on replacing the oil cooler since it's the original and hope that's the culprit.
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.
10 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: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Have a 99' 996 C4 with the dreaded intemix issue which most likely is due to a cracked head(s).
Can anyone in the NYC metro area who may have this unfortunate experience be able to give me an idea as to what to expect cost wise to drop the engine & remove both heads (thinking of sending the heads to Len Hoffmann) and cost to re-assemble all.
Trying to decide if i should fix or sell the car as is. Also a reputable shop in the NYC metro area that can handle this?
Much appreciative of any advise.
Sorry to resurrect an old thread (It wont let me message you), but I am having oil in coolant, but it is a very small amount, like maybe a few ounces. Did yours have a lot when it was the oil cooler?
Thanks
Sorry to resurrect an old thread (It wont let me message you), but I am having oil in coolant, but it is a very small amount, like maybe a few ounces. Did yours have a lot when it was the oil cooler?
Thanks
Actually, a bit of each in the coolant and the oil. Thus far I have not done anything since I've only placed about 1,000 miles per year since when first noticed. Since changing the coolant and oil I've noticed less of an intermix. Planning on replacing the oil cooler since it's the original and hope that's the culprit.
FWIW if you ever need it, Len did my heads with his Stage II porting/polishing/full service/racing valve springs/brass freeze plugs w epoxy for around $3250 incl shipping from upstate NY and back. This was in fall of 2023?
