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Originally Posted by SD987
Well, here is a challenge. Run the oil for 20K MILES and then take a small sample and send it to Blackstone labs for analysis. I think this is a $15 charge or so.
Then report back to us. I think you will be literally amazed at what our dear Porsche engineers have been recommending.
To save you some trouble, using M1 0W-40 oil, the UOA I have seen indicate that this oil is SHOT at about 10K miles tops.
That is NOT true of Red Line oil which is likely good for 15K.
..umm, what exactly would running your test indicate? In order to be of any value, sampling would have to be done at intervals (say, every 5k), along the way. No doubt the oil degrades but is the degradation at 20k so much more versus 15k, or 10k or 5k to justify an earlier interval? At what point does the oil degradation justify changing it? I'm guessing both Porsche and the engine oil companies have run just a couple of these tests.
And your response doesn't answer the question posed by z12358. If a shorter interval was required, why wouldn't Porsche simply state that? There's nothing to gain with a shorter interval, no prestige is bestowed on a marque for having the longest oil change interval, nor is there "shame" in a shorter interval. There's only the downside of increased warranty claims, as noted by z. And there's only downside in a long interval for a company trying to sell oil. Yes, M1 wants to be known as a "long lasting oil", but that reputation could be garnered with a 10k interval.
I know you enjoy bashing Porsche on maintenance/reliability but there's little credibility in a Porsche/Oil conspiracy. If there is a conspiracy, Mercedes (my SLK interval is 13k) must be "in on it" to, then.
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No conspiracy and no bashing. And my credibility is fine thanks.
Here are several quick points.
1-The point was raised above that Porsche was SOUNDLY criticized for years for the cost of routine maintainence. One way to counter that was to move the period out a bit. On things like spark plugs etc, no big deal.
However, your theory about how you are sure they tested oil quality etc. is just that, a theory. Moreover, Porsche has shown quite clearly that they are really concerned about warranty costs, not ownership costs. The "price" of using shot oil shows up later, not during the warranty period. The price is excess wear.
Re: the oil testing, frankly that has been done to death on Bob is the Oil Guy's website. The oil analysis shows things like wear metals in the oil, additives left in the oil, viscosity retention and the like. These are compared to the oil when new.
Bottom line, if you want to ride say 10K miles with oil that has basically had it, go ahead and do it.
It is scant solace indeed when your Box engine is shot and you comfort yourself that you followed those brilliant engineers recommendations.
Of course, we don't know who made these recommendations, the engineers or the finance VP.
BTW-My service tech admits off the record that the 20 K is bogus.
But hey, it is your car. Risk the 15Grand engine on basis of faith in the factory.