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2008 BMW M3, BMW TwinPower Turbo 10W-60, 4945 mi #5210824 09/12/19 10:02 AM
Joined: Oct 2005
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d00df00d Offline OP
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Previous UOA here. Now at 95449 miles on the engine.

Two road trips, a few blasts at the Tail of the Dragon, one tank of no-name non-ethanol gas, and one Techron treatment on this run. Also caught and fixed a pre-cat exhaust leak on one bank near the end, so there's probably some sub-optimal running as well (might explain the fuel dilution).

No idea where the silicon has come from. Maybe the VC gasket change I did just before this oil went in?

Copying the numbers here because Polaris's reports are kind of annoying to read:


Iron - 7
Chromium - 0
Nickel - 0
Aluminum - 2
Copper - 2
Lead - 0
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Silicon - 23
Sodium - 2
Potassium - 1
Titanium - 0
Molybdenum - 49
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 52
Magnesium - 30
Calcium - 2490
Barium - 0
Phosphorus - 840
Zinc - 957

Fuel Dilution - 1.8% (GC)
Soot - <0.1% by vol.
Water - <0.1% by vol. (FTIR)

Viscosity @ 100º C - 18.3 cSt
TBN - 5.26
Oxidation - 11
Nitration - 10

Particle Quantifier (PQ) Index - 12

[Linked Image]


2008 BMW M3 Sedan 6MT
Re: 2008 BMW M3, BMW TwinPower Turbo 10W-60, 4945 mi [Re: d00df00d] #5210834 09/12/19 10:12 AM
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BMWTurboDzl Offline
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Did you really have to add 4 liters within 7k miles (6/19) and 1 liter within 5k miles for this most recent change?

IIRC the S65 has low tension rings so perhaps the fuel dilution is normal?


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: 2008 BMW M3, BMW TwinPower Turbo 10W-60, 4945 mi [Re: BMWTurboDzl] #5210846 09/12/19 10:32 AM
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d00df00d Offline OP
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Originally Posted by BMWTurboDzl
Did you really have to add 4 liters within 7k miles (6/19) and 1 liter within 5k miles for this most recent change?

Yep. Valve cover gaskets were leaking, and the oil cap wasn't quite sealing properly (common on these cars). Fixed the VC gaskets and improved the oil cap seal near the end of the 7k OCI. 1L top-off intervals went from ~1800 mi to ~2800 mi.

Originally Posted by BMWTurboDzl
IIRC the S65 has low tension rings so perhaps the fuel dilution is normal?

Got me. Most UOAs on this engine are from Blackstone so it's hard to find comparable measures of fuel dilution.

I'm sure some amount of fuel dilution is normal. I just don't know how much.


2008 BMW M3 Sedan 6MT
Re: 2008 BMW M3, BMW TwinPower Turbo 10W-60, 4945 mi [Re: d00df00d] #5210876 09/12/19 11:16 AM
Joined: Oct 2010
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A_Harman Offline
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The fuel dilution has been steady through all the UOA's listed on Polaris' sheet. Seems like that's a characteristic of this engine.

Someday, somebody should do a study of how X% fuel dilution causes Y% oil viscosity loss.


2008 Dodge Ram 3500 diesel/G56
1985 Z51 Corvette track car 355/6-speed
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel/NV4500+GV
1972 GMC 1500 shortbed project truck 307/SM465
Re: 2008 BMW M3, BMW TwinPower Turbo 10W-60, 4945 mi [Re: d00df00d] #5210885 09/12/19 11:32 AM
Joined: Oct 2010
Posts: 7,756
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A_Harman Offline
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Originally Posted by d00df00d
Previous UOA here. Now at 95449 miles on the engine.

Two road trips, a few blasts at the Tail of the Dragon, one tank of no-name non-ethanol gas, and one Techron treatment on this run. Also caught and fixed a pre-cat exhaust leak on one bank near the end, so there's probably some sub-optimal running as well (might explain the fuel dilution).

No idea where the silicon has come from. Maybe the VC gasket change I did just before this oil went in?

Copying the numbers here because Polaris's reports are kind of annoying to read:


Iron - 7
Chromium - 0
Nickel - 0
Aluminum - 2
Copper - 2
Lead - 0
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Silicon - 23
Sodium - 2
Potassium - 1
Titanium - 0
Molybdenum - 49
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 52
Magnesium - 30
Calcium - 2490
Barium - 0
Phosphorus - 840
Zinc - 957

Fuel Dilution - 1.8% (GC)
Soot - <0.1% by vol.
Water - <0.1% by vol. (FTIR)

Viscosity @ 100º C - 18.3 cSt
TBN - 5.26
Oxidation - 11
Nitration - 10

Particle Quantifier (PQ) Index - 12

[Linked Image]


Do you pay extra to get the Particle Quantifier Index measurement?


2008 Dodge Ram 3500 diesel/G56
1985 Z51 Corvette track car 355/6-speed
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel/NV4500+GV
1972 GMC 1500 shortbed project truck 307/SM465
Re: 2008 BMW M3, BMW TwinPower Turbo 10W-60, 4945 mi [Re: d00df00d] #5210940 09/12/19 12:53 PM
Joined: Apr 2010
Posts: 5,622
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jeepman3071 Offline
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Having done Tail of the Dragon in my 328i, I can only imagine what it's like in an M3. drive


1998 Jeep Wrangler Sahara 4.0L/5MT (156k) - PHM 10w30, Wix 51085
2009 BMW 328i N51 (60k) - Liqui Moly 5w40, MANN HU816X
Re: 2008 BMW M3, BMW TwinPower Turbo 10W-60, 4945 mi [Re: jeepman3071] #5210981 09/12/19 01:47 PM
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d00df00d Offline OP
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Originally Posted by A_Harman
Do you pay extra to get the Particle Quantifier Index measurement?

It's part of Polaris's "Advanced Engine Plus" test package. Great deal, BTW -- less than $24 apiece if you buy the 10-pack.


Originally Posted by jeepman3071
Having done Tail of the Dragon in my 328i, I can only imagine what it's like in an M3. drive

If you like pucker moments and brake fade, it's great! LOL

I felt the M3 was much more at home on the Cherohala Skyway. The Tail just felt too tight for a 3700 lb car with >400 hp and a normal-ish CoG height, at least for my tastes. JMO.


2008 BMW M3 Sedan 6MT
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