he reckoned it was far too much of a drop to be explained by degradation after 7,500 miles for a synthetic oil, maybe down to 135 from 155, but not 115. Also, about 1000 miles before the used oil was tested, I added about 1/2L of TWS, so that would have raised the viscosity in the sample.
In my experience, by 7500 miles TWS10w60 is sheared down to a 'heavy 40 weight'... there are probably UOAs posted on this board that will show it.
The thicker the oil, the FASTER it will shear down. BWM LL5w30 is so thin that it doesnt have much shearing, in terms of where it starts (and hence can go stupid long intervals) TWS will drop fast in the S62.
In my experience, by 7500 miles TWS10w60 is sheared down to a 'heavy 40 weight'... there are probably UOAs posted on this board that will show it.
The thicker the oil, the FASTER it will shear down. BWM LL5w30 is so thin that it doesnt have much shearing, in terms of where it starts (and hence can go stupid long intervals) TWS will drop fast in the S62.
A
7500, in my experience, seems to be the magic # for TWS
All I know is I've owned my M5 for 2 years + and I don't drive it in the winter (cold temps). I change my oil each year in the spring and drive very little (75K on my '00 M5). I use the TWS @ 12/litre, and replace my filter....yes my oil change each year costs me ~115.00 US dollars. I complained during my most recent change this season and my customer rep told me to hit the tripometer and get back to him when it runs low b/c there are hoses on the intake that can suck oil back into the plenum (pretty basic concept of EGR). I checked my oil the other day after 550 miles of around town/occasional short distance hard driving. The oil was reaching the low point at 550 miles of daily driving....and yes it's all coming out of my tailpipes as I recently upgraded to the MagnaFlows and my shiny tips are constantly filthy after a week of driving around... I'm wiping them down to make them look nice. At this point my local stealer agrees that $12/litre is expensive and all they're saying is they can start to chart/log/document the consumption which I'm sure won't be free (I can (and have) been doing that myself). Bottom line is with 75-76K on her this may be a good time to unload it since it doesn't seem the problem will go away and I'm getting sick of topping off oil 75-100 days after I change the oil. It's a awesome beast but it does get old. Maybe I'm just getting frustrated but it gets old running to the stealer for oil every couple mos....but she is a great ride! Amazing machine!
__________________ 2006 E60 M5 Beast (Bone stock and loving it!)
Owned at one point: 2000 M5 Avus Blue Metallic
My 1st M - gone but never forgotten 1998 328i 4 dr sedan
Lowered w/Eisenmann exhaust 1995 525i
Underpowered but a classic look 1988 325i
Vintage bimmer! Nuff said
Last edited by JayDubb; 13th October 2009 at 22:32.
Reason: typo
I usually get about get between 600 and 1000 miles per litre.
I never let it go below half way on the dipstick !
Oil consumption CAN vary during the course of a car's life AND between different cars with the same piston ring design AND also between old and new piston ring design cars AND with differing driving styles.
I bought my one on 94K Miles and now on 117K Miles and its been pretty constant throughout, depending on driving style.
March '00 is the supposed implementation of the new ring design.
Can you do me a favour and open both your air filter housings and tell me if there is any evidence of oil in there please ?
I've had my 2000 M5 for three months now and have put 4,000 miles (mostly highway) on it. It has 58,000 miles on the odometer. I checked the oil yesterday and there has been minimal activity on the dipstick. I'll take the car in for the Insp II/60,000 service in early December, and I'd bet the oil level will stay the same over the next 1,000-2,000 miles. So far, the oil on the dipstick has dropped maybe 1/4 inch and I have not had to add a drop of oil. My 1995 M3 has over 125,000 miles on it, and that I-6 is revved up more than the V8, all the time, and it does not use/lose one drop of oil between regular 3,000 oil changes either. That's my story and I'm stickin' to it!
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