"Acceptable" oil consumption - Page 3 - BMW M5 Forum and M6 Forums
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post #21 of 27 Old 14th April 2016, 02:34 AM
Novabimmer
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post #22 of 27 Old 14th April 2016, 04:34 PM
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My impression is that the S85 is more prone to drinking oil at cold startup in cold weather. I made a 1000-mile trip and the oil gauge never moved. I did an oil change when I got the M5 home and it did not appear to consume any oil during the warmish late-fall months. Over the winter, with mostly short drives (7 miles, give or take) and temps in the 20-40F range, the gauge indicated that I had to add a quart about 2500 miles after the oil change. Now the weather has warmed up and the oil level has seemed to stay pretty consistent. I always keep it under 3000rpm and use very light throttle until the oil temp gauge is most of the way to the 210 mark. I'm running M1 0W40.

This is, of course, based on one winter of ownership and one OCI, so it's hardly a long-term scientific observation.

--'08 M5 - 38K miles, 6-speed, Interlagos Blue, muffler delete, RPI scoops, charcoal delete
--'04 Mustang Cobra, bolt-ons, ~460rwhp (blower upgrade and 600rwhp coming soon)
--'08 Buell 1125R, '14 Yamaha Vmax, '05 Triumph Speed Triple, '03 Suzuki DRZ-400E

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post #23 of 27 Old 14th April 2016, 06:48 PM
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post #24 of 27 Old 18th April 2016, 05:40 PM
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Quote:
Originally Posted by Novabimmer View Post
I hate to be "that guy", but does M1 0w-40 meet spec for M cars?
From what I've read, yes. Originally it was 10W60 only, and it later got modified to include 0W40 and even 5W30.

--'08 M5 - 38K miles, 6-speed, Interlagos Blue, muffler delete, RPI scoops, charcoal delete
--'04 Mustang Cobra, bolt-ons, ~460rwhp (blower upgrade and 600rwhp coming soon)
--'08 Buell 1125R, '14 Yamaha Vmax, '05 Triumph Speed Triple, '03 Suzuki DRZ-400E
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post #25 of 27 Old 18th April 2016, 06:33 PM
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Maybe y'all should listen to the guy who replaces more spun bearings and engine internals than anyone and stick with 5-50 min and 10-60 if its hot
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post #26 of 27 Old 26th September 2016, 05:07 PM
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New owner here. Bought mine 3 months ago with 76,100 miles, base lined it (oil change, spark plugs, filters, diff, trans, brakes, tires, etc). Exclusively drove it around town and some highway short trips (under 100 miles), oil gauge never moved in 2500 miles. Then last week I took it on a long road trip to NC (500 miles), again, oil gauge never moved. Then on my way home I noticed after my first fuel stop it was 2 ticks lower, the temp was much lower so I thought maybe it was just an error. After about 350 miles into my trip I saw it was lower again, then about 40 miles from home it popped up on the HUD "Oil level at minimum level!" and the computer told me to add 1 liter. I stopped immediately and put 1 liter in, then the level was back to between the 2 arrows.

3500 miles since my oil change and it did 1 liter, I'm not worried about that at all. The thing that was weird was how quick it dropped. Has anyone else experienced a rapid drop like that? Or is it just that it probably didn't accurately portray the level and I slowly burned up 1 liter in 3500 miles?

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post #27 of 27 Old 3rd October 2016, 01:50 AM
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Here's the actual BMW Service Bulletin for oil consumption, which I've posted in the E34 M5 forum. You'll see that BMW considers 2.5 quarts every 1000 miles to be okay, on an M car.: (I don't)


SI B11 03 13
Engine August 2013
Technical Service This Service Information bulletin supersedes SI B11 03 13dated May 2013.
[NEW] designates changes to this revision
SUBJECT
Engine Oil Consumption MODEL
All INFORMATION
All engines normally consume a certain amount of engine oil. This is necessary in order to properly lubricate the cylinder walls, pistons, piston rings, valves and turbocharger(s), if equipped. [NEW] In addition, engines with less than 6,000 miles will generally consume additional engine oil because the internal engine components are not fully seated (break-in). Therefore engine oil consumption analysis should be performed after this break in period.
Once a new or remanufactured engine has accumulated 6,000 miles, oil consumption can be considered if there is a drastic change in the engine oil consumption rate (e.g., the engine oil consumption rate triples) under similar driving conditions.
Engines equipped with a turbocharger(s) will consume more engine oil than normally aspirated engines (non-turbocharged). The additional oil that is consumed in a turbocharged engine is mainly due to the turbocharger lubrication requirements. Some of the engine oil normally migrates past the turbocharger turbine bearing seals and will enter the intake tract of the engine. All turbocharged engines also require a complex crankcase ventilation system. The crankcase ventilation system needs to maintain a small vacuum on the crankcase and not allow the crankcase to be pressurized.
Pressurizing the engine crankcase can lead to external engine oil leaks and increased engine oil consumption via the piston rings and valve seals. When the load and the boost level of a turbocharged engine is varied, the path of the crankcase pressure is changed. During the crankcase ventilation path transition, a small amount of engine oil will pass through the crankcase ventilation system and is additionally consumed. The additional engine oil consumption of a turbocharged engine, as compared to a normally aspirated engine, is normal and not a defect.
OIL CONSUMPTION SPECIFICATION
All BMW engines (excluding Motorsport) can consume up to 1 quart of engine oil per 750 miles at any time.
Due to the increased engine power, all Motorsport engines can consume up to 2.5 quarts of engine oil per 1,000 miles at any time.
DIAGNOSTIC HINTS
When an oil consumption complaint is received, it may be possible to correct it without performing extensive engine repairs. Check the following frequent causes of excessive oil consumption prior to undertaking any engine consumption analysis or repairs. Submit a PuMA case for assistance. Proper Maintenance
Has the vehicle received proper maintenance? Certain external conditions (mainly city driving style and/or high engine loads; poor fuel quality; and extreme ambient temperatures), combined with excessively long oil service intervals, may accelerate engine oil degradation, which may cause premature wear of the engine components. Continuous city driving (stop-and-go traffic); fuels with high olefin content; sulfur and certain aromatic fractions; and very high ambient temperatures are the most influential factors causing premature oil aging and consecutive engine mechanical deterioration.
External Leakage
The engine should be leak-free before starting any engine oil consumption analysis.
Overfilling
If the oil level is too high, oil in the crankcase will be thrown against the cylinder walls and consumed. Check the dipstick markings or electronic measurement (as equipped) to be sure of accuracy. The oil level must not be higher than the upper mark.
Engine Oil Viscosity/Quality
The use of oil with the wrong viscosity rating for operating conditions can cause high oil consumption. Check the Owner's Manual to determine the proper viscosity for prevailing conditions.
Engine Speed and Load
If vehicle operating conditions are severe, oil consumption will be higher than normal. Extreme load or continuous high engine speed will result in increased oil consumption.
Crankcase Ventilation
The crankcase ventilation systems use various different crankcase ventilation valves, depending on the engine type. Although the valves all look different, they function similarly, using a spring and diaphragm assembly to control the crankcase pressure. A properly functioning pressure control valve is designed to maintain a slight vacuum (under-pressure) in the crankcase, which assures reliable crankcase venting during all engine operating conditions. One of the results of a malfunctioning crankcase ventilation system can be increased engine oil consumption. Refer to SI B11 03 08 for measuring specifications and procedures.
Turbocharged Engines
Engines that are fitted with a turbocharger(s) will consume more engine oil than naturally aspirated engines (non-turbocharged engines). In this case, a turbocharged engine could require topping of engine oil more frequently. For vehicles with N63 and N63T engines, refer to SI B11 01 13 for additional details.
[NEW] N63, N63T AND N74 CUSTOMER INFORMATION
Provide the attached brochure to the customer when up topping the engine oil: B110313_Oil_Consumption_Customer_Brochure_07_19_20 13
WARRANTY INFORMATION
Not applicable.

Chris Powell
BMWCCA 274412
3x recertified Master Tech
Racing, skid, and HPDE instructor since 1978, for Brands Hatch, Skip, SCCA and BMWCCA
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