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One for the Techies...

If an engine is burning a lot of oil i.e approx 1l per 600 miles then would this lead to carbon deposits in the cylinders due to the conbustion stroke and would this not lead to scoring of the walls after time - and how long?

and in a 56k mile car with a full dealer service history that cost 60k GBP when new is this acceptable?

Cheers
JB
 

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Heavy oil consumption can lead to carbon deposits in the combustion chamber that will raise compression ratio a bit, but oil vapor itself will tend to lower "octane" number of the fuel-air mixture. The effect is fairly minor, but a non-ping-sensor engine will definitely knock a bit more. You will never hear this on the M5 of course, as the ping sensors will retard the spark.

Regards, Dick Roberts
 

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What heavy oil consumption will do is foul O2 sensors, and over enough time can plug up cats. Most the soot will burn up in the cats, but after awhile they can fail. If it is using that much oil, have it looked at!
:cheers:
 
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