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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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Old 03-17-2014, 07:39 PM
KDiggityDog76 KDiggityDog76 is offline
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Mein Auto: 2007 BMW Z4 M Coupe
Low Mileage Interim TWS Oil Analysis

Hey guys, I thought it might be useful to someone to see an oil analysis from a S54-engined 2007 Z4M Coupe that doesn't get driven a whole lot (36,845 mi), as there may be a couple of you out there worried about long duration oil changes on low mileage cars. I use the TWS 10W-60 oil from BMW, and I've got 14 months but only 3800 mi on this oil. I sent a sample to Blackstone Laboratories for analysis, and this is the report they sent me:

I should mention that most of the driving I do involves a somewhat long-ish freeway component to get the oil up to operating temp to burn off whatever water may have accumulated there. Under my specific circumstances, this oil appears to have been fine for 14 months with this little mileage. I should mention I use the OX187D oil filter with this oil. This motor consumed zero oil over the duration it was in use. I live in California (temperate climate) and keep the car garaged when it's not in use. I was able to drain and replace about 5.3 bottles of oil at each change.
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