Quote:
Originally Posted by JCL
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More certain than uncertain. I know you believe that some little widget in the sump is some sort of oil condition analyzer. In that link, you link to another thread where there is some TIS about an oil condition sensor found in N52 engines. Well, none of us have N52 engines, so that really isn't applicable.
And, if there really was a true oil condition sensor, then when I had my N54 powered 335i, would it not have increased the mileage to the next service when I did mid-cycle oil changes? Clearly the condition of my oil varied significantly, even regardless of miles, based on the Blackstone test. MY CBS never did increase the miles, it only counted down. So maybe there is a sensor, but it doesn't work for shit. If the systems are supposed "that smart", why would they suddenly become stupid and not figure out that the oil quality increased?
Also, my comment about the CBS being based mostly on fuel consumption is lifted directly from SIB 12 25 05 where is specifically states: "It is the total fuel consumption, and not the accumulated mileage, which influences when the next oil service will be forecast as due." And since we are talking about the forecast here (the stupid number in the display until the next service), my statement is accurate. The number may count down faster the closer you get to it, per the SIB, but what do we see every time we start the vehicle? The forecasted mileage to the next service of course!
In addition, that SIB was updated in July 2008, and references CBS4 (as well as models E70 and E90, which were introduced in 2007.) So it is current and up to date.
Regardless, based on my experience with the N54 and oil testing, I'll probably do oil changes between 6,000 and 7,000 miles. After a few tests come back, I may extend the interval based on the results. But I have more faith in Blackstone's report than the CBS.
At least with a dipstick, I may be able to pull an oil sample without having to drain the engine. Any one manage to do that?