9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 Oil Recommendations...Again
Leading reported evidence
Run mobil1 5w-40
Performed · outcome unconfirmed
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 performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
I ran Mobil1 5w-40 for a few years and switched to Motul 5w-40 because the viscosity holds up a bit better than Mobil1.
Leading evidence: 'Run mobil1 5w-40' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'early bore scoring' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace i'm switching' (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 suspect a cause
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause · Original poster
PCA/LN suggests for DRIVEN oils, 996 should use their moly-formulated DT-40 (Synthetic 5W-40), but also suggests that if you are in a warm climate and suspect early bore scoring, that the use of FR-50 (Synthetic 5W-50) is more appropriate.
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
I'm not a chemist; I just play one on TV, so for my next oil change, I'm switching to DT40 and finally following Lake's advice.
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.
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Suggestion
I�ve been using DT-40 for my last 4 oil changes, and I think it�s working well.
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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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
I started using Mobil 1 5w-40, but it was losing viscosity quickly.
Use of fr-50 (synthetic 5w-50) is more appropriate
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
PCA/LN suggests for DRIVEN oils, 996 should use their moly-formulated DT-40 (Synthetic 5W-40), but also suggests that if you are in a warm climate and suspect early bore scoring, that the use of FR-50 (Synthetic 5W-50) is more appropriate.
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
PCA/LN suggests for DRIVEN oils, 996 should use their moly-formulated DT-40 (Synthetic 5W-40), but also suggests that if you are in a warm climate and suspect early bore scoring, that the use of FR-50 (Synthetic 5W-50) is more appropriate.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
early bore scoring
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect 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.
Suspected cause · Original poster
PCA/LN suggests for DRIVEN oils, 996 should use their moly-formulated DT-40 (Synthetic 5W-40), but also suggests that if you are in a warm climate and suspect early bore scoring, that the use of FR-50 (Synthetic 5W-50) is more appropriate.
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.
9 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: 20261027T060112Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have a 1999 996 and was reviewing the 1999 Owner's Manual recommendations vs. indie shop advice, and advice found here. Lots of conflicts!
I am trying to follow Lake Speed Jr's principles of
RIGHT oil
RIGHT place
RIGHT time
RIGHT quantity
Factory specifies for synthetics:
SUMMER (>50F) 10W40, 15W-40. 15W-50
WINTER (<14F) 10W-40, 10W-30, 5W-30
PCA/LN suggests for DRIVEN oils, 996 should use their moly-formulated DT-40 (Synthetic 5W-40), but also suggests that if you are in a warm climate and suspect early bore scoring, that the use of FR-50 (Synthetic 5W-50) is more appropriate.
DRIVEN also offers a GP-1 15W-40 (synthetic blend) oil but it has a lot more zinc...might be appropriate for drag racers needing more of this, but not of much use to the aluminum/aluminum issues with bore scoring.
So any recommendations are sought and most welcome. Trying to do this by "science; not speculation!"
Yeah, the Driven stuff is probably best.
I ran Mobil1 5w-40 for a few years and switched to Motul 5w-40 because the viscosity holds up a bit better than Mobil1. I have relatively high oil pressure in my 99 996 (1.5bar at idle, 5bar at 3k and above), so I stick with 5w40 unless I�m tracking (5w/50 for that).
Motul has a 5w-40 Sport motor oil that seems to handle high temps better than their X-Cess Gen2 5w-40.
I�ve been using DT-40 for my last 4 oil changes, and I think it�s working well. The ambient temps I drive in are between 30*F and 100*F. I�m burning about a half-qt every 400-500 miles.
Before the DT-40, I was using Motul X-Cess Gen2 5w-40. It was fine, but I switched because I wanted the higher moly content from the DT-40.
The PCA oil thread above convinced me to switch to DI-40 for my next oil change.
I started using Mobil 1 5w-40, but it was losing viscosity quickly. Lake @ Speediagnostix confirmed that Mobil 1 5w-40 shears and drops viscosity down to 30 weight range with a minimal amount of miles (~1500 over 6mos in my case)
I switched to Amsoil 5w-40, but because it's low in moly, I supplemented it with LiquiMoly Ceratec.
I'm not a chemist; I just play one on TV, so for my next oil change, I'm switching to DT40 and finally following Lake's advice.
You Tube
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