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Old 02-27-2010, 09:43 AM
QSilver7's Avatar
QSilver7 QSilver7 is online now
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Mein Auto: 1997 740iL / 2006 X5 4.4
Service Indicator Display: fuel is only value used to determine ''load''

I was researching info about the e39/e53 (X5) low instrument cluster...and ran across the info below that went into greater detail about SIA III (service indicator display III).

Before today, I was still INCORRECTLY assuming that the same values used in SIA I and SIA II (fuel, mileage, engine temp, RPM) were still being used to determine "load".

The old SIA I formula was e=a(1+t+r) where:
  • e = estimated mileage
  • a = actual mileage
  • t = 1 (if engine operating temps is below normal) otherwise t=0
  • r = .5 (if engine is above 4500 RPM) otherwise r=0

So under this old calculaton, if you drove 5 miles with a cold engine @ 5000 RPM...the SIA I would calculate "e" as 12.5 miles although you only drove 5 miles:
  • a = 5 (the actual miles driven)
  • t = 1 (since the engine was cold and never reached normal operating temps)
  • r = .5 (engine exceeded 4500 RPM)
  • e = 5(1+1+.5)= 12.5 estimated miles

But starting with the 1996 model year...BMW started implementing SIA III where fuel is the ONLY value used to calculate "load"...see the info below for more details:

Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)
Old 03-11-2010, 05:30 AM
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rrtec rrtec is offline
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Good to know. Thanks for posting that!
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