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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHOil Comparison Test: Toughts?
Leading reported evidence
Run 10w60
Performed · outcome unconfirmed
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Read evidence and context
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Suggestion
If you are really concerned, change it every 7500 miles, but the Used oil analysis (plural) I have seen on 996's show the factory M1 0w-40 holds up fine for the recommended interval.
Leading evidence: 'Run 10w60' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Recommend interval' (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
Search the used oil analysis on bobistheoilguy and look at the few where people actually ran the BMW Branded oil for the full interval of 14,000-16,000 miles.
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Hmmm...well I guess that explains my experience since my brothers 540 (and the 540s of the people I know who have had their oil tested) tell him to change the oil typically between 7000-8000 miles.
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Performed · outcome unconfirmed
The closest thing we have to doing teardowns of engines are used oil analysis, but they are really only good for comparing oils in the same engine with the same because the wear numbers can not be compared between different motors, much less the varience introduced by different driving conditions.
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Suggestion
If you are really concerned, change it every 7500 miles, but the Used oil analysis (plural) I have seen on 996's show the factory M1 0w-40 holds up fine for the recommended interval.
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Recommend interval
No successful repair reported for this finding.
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Unsuccessful attempts
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Read evidence and context
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Suggestion
If you are really concerned, change it every 7500 miles, but the Used oil analysis (plural) I have seen on 996's show the factory M1 0w-40 holds up fine for the recommended interval.
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Suggestion
Hmmm...well I guess that explains my experience since my brothers 540 (and the 540s of the people I know who have had their oil tested) tell him to change the oil typically between 7000-8000 miles.
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Suggestion
I did see an article that explained how Castrol had switched from synthetic base to petroleum base for it's syn products - without changing the synthetic branding on the product.
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Performed · outcome unconfirmed
Search the used oil analysis on bobistheoilguy and look at the few where people actually ran the BMW Branded oil for the full interval of 14,000-16,000 miles.
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Suggestion
And you don't see anyone stepping up with a dozen new cars, running each of them for 100,000 miles on a different oil, and then doing a complete strip-down and wear analysis.
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Suggestion
For people that want to run the full 15k intervals specified by BMW should be using a LL-01 oils, of which Mobil 1 0w-40 is the most widely available one in the US.
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Rennlist: 1 discussions
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Generation: 20261026T203514Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My friend sent me this and I dont really have the time to critically analyse it right now so i'll just post it up here for all the engineers, phd's, oil industry people, shadetree mechanics and keyboard commandos to disect.
Cheers
CLICK HERE FOR THE PDF
It leaves me wondering why they didn't test Valvoline full synthetic (or is that one of the missing pages?). I'm also curious how Mobil 1 did so poorly.
What about AMSOIL?? Here is another good article.....
http://www.performanceoilnews.com/oi...nst_oils.shtml
Really makes you wonder??????????????????????/
It's about as relevant as me writing up and oil comparison test report based on using different oils in my espresso machine!
The problem with any test rig, is that it's just a test rig, it's not an engine!
And you don't see anyone stepping up with a dozen new cars, running each of them for 100,000 miles on a different oil, and then doing a complete strip-down and wear analysis.
So you're left with BS reports and product marketing BS from manufacturers.
Unless of course you regard the Motor Oil Bible as a good read
http://www.trustmymechanic.com/motor-oil-bible.pdf
Drive by posting.
The closest thing we have to doing teardowns of engines are used oil analysis, but they are really only good for comparing oils in the same engine with the same because the wear numbers can not be compared between different motors, much less the varience introduced by different driving conditions.
At the end of the day, any quality oil by a major manufacture that is on Porsche's approved oil list will provide more than adequate protection. If you are really concerned, change it every 7500 miles, but the Used oil analysis (plural) I have seen on 996's show the factory M1 0w-40 holds up fine for the recommended interval. This is in contrast to the BMW labeled Castrol Synthetic that falls apart short of the recommended change intervals in BMWs.
Have you really found that about the BMW labeled oil? I've never had my brother's tested, but I know people with E39 540's who have had the oil tested when the lights go out and it comes out fine.
I did see an article that explained how Castrol had switched from synthetic base to petroleum base for it's syn products - without changing the synthetic branding on the product.
Could effect longevity of the product in use.
Search the used oil analysis on bobistheoilguy and look at the few where people actually ran the BMW Branded oil for the full interval of 14,000-16,000 miles. It was not pretty. The oil is a decent oil and works great in shorter intervals (10,000 or less is a safe interval), but gives up the ghost for the longer intervals.
It is worth noting that the BMW branded oil sold here only meets BMW LL-98, not the superior BMW LL-01 spec that BMW themselves promulgates. (BMW LL-01 does not allow Group III hydrocracked oils, only Group IV or Group V basestock oils, so the BMW Labled castrol sold in the USA, which is a Group III oil cannot qualify). I'm not sure how BMW USA is able to get away with this. For people that want to run the full 15k intervals specified by BMW should be using a LL-01 oils, of which Mobil 1 0w-40 is the most widely available one in the US.
Now back to Porsche talk. Need to keep this on topic, I'm a former BMW guy (wife still drives them) striving to meet my 20 year dream of having a car with a flat six in the rear, and no, a Corvair will not do.
Hmmm...well I guess that explains my experience since my brothers 540 (and the 540s of the people I know who have had their oil tested) tell him to change the oil typically between 7000-8000 miles.
On the E46 M3 I ran 10w60. Yeah that's right! 10 w 60. Couldn't even find anyone else but Castrol that made it and for the first couple years I HAD to buy it at the dealership. Bav auto set me up later. In fact, I still have a case in my garage. Talk about useless. Anyways, I am a paranoid mf. I 'm not going to let my oil sit unchanged for more than 10k miles (or 5k to be honest) no matter how much the manufacturer tells me it's ok. I've always felt there's more to consider than just the quality of the oil when you think about changing the oil. Is that a professional statement? No, just my own paranoia. Alright, really every 3k miles but no more than that, I swear.
This is a source reference. Confirm exact model applicability in the original material.
