I purchased a 79 450 SEL with an odometer reading of 86,472 miles. How do I know if this is 186,472 or 286,472?

Does the odometer restart after 100,000 miles?

odo has 6 digits, it will flip after 999,999

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Current cars:
2001 MB E55 AMG
2003 Honda S2000
2000 Honda CRV

Gone but not forgotten:
2004 BMW 325i 5sp sport
1999 BMW 540i sport
1997 MB E420
1995 BMW M3 coupe

79 with 86,000 actual miles.....I do know that it is a 2 owner, garage kept and most local driving.

Normally, if an odometer has been tampered with, the numbers will not line up 100 % ( unless done by a real " Pro ").
You can also look for other telltale signs, i.e. brakepedal rubber badly worn, etc.

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2007 C 230 Sport.