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Re: Why do M5's burn so much oil? (archive)
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Posted by M5_ZZT on March 10, 2002 at 11:45:50:

In Reply to: Why do M5's burn so much oil? posted by Nik on March 09, 2002 at 16:37:50:

As has been discussed on this board ad nauseum, the reason the M5 burns oil (more than an AMG E55) is as follows:

1)Racing-based piston rings.
2)Higher compression ratio 11.0:1
3)8 individual throttles
4)Multi-valve design

The AMG E55 is just a bored out 5.0 liter V8 with a supercharger. It does not employ racing piston rings, it has lower compression, and is only a 3 valve design with a single overhead camshaft. It does not employ technology like VANOS (variable valve timing and lift).

Multi-valve, high compression, race-based engines burn oil. Case in point; the new Porsche 911 Turbo burns just as much oil as the M5 and even uses the same racing synthetic. So in a nutshell, while the AMG division makes fine automobiles, their engine technology is basicly old school "bigger displacement with forced induction" methodologies. BMW uses more cutting-edge engine engineering.

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