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I cannot vouch for this information, but I was told to always keep the revs in a diesel car around 2-2500 rpm and not labour the engine as under revving kills a DMF.

I try not to let the revs drop even drop down a gear to keep the revs high. I wonder sometimes people may use a too high gear for the sake of economy.

Quote: Originally posted by The Vicar on 14/10/2013

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I cannot vouch for this information, but I was told to always keep the revs in a diesel car around 2-2500 rpm and not labour the engine as under revving kills a DMF.

I try not to let the revs drop even drop down a gear to keep the revs high. I wonder sometimes people may use a too high gear for the sake of economy.

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Quote: Originally posted by janus on 14/10/2013

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So I can forget about 5th and 6th gear then if I want to stay driving at a legal speed, and also forget about 4th unless I am on a Dual carriageway? My car has a little arrow that lights up when a higher gear is selecte, this occurs at about 1500 rpm when the car reaches maximum torque.

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Quote: Originally posted by Jack+Jon on 14/10/2013

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Quote: Originally posted by janus on 14/10/2013So I can forget about 5th and 6th gear then if I want to stay driving at a legal speed, and also forget about 4th unless I am on a Dual carriageway? My car has a little arrow that lights up when a higher gear is selecte, this occurs at about 1500 rpm when the car reaches maximum torque.

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To explain...Engines peak at different revs but with a dmf its less obvious when the engine begins to labour. It won't do so at normal motorway cruise speed in any gear but could do if you slow down on a motorway incline for example, then you need to drop a gear.

The purpose of the dmf is to smooth out the vibration through the drive train particularly with a diesel & makes modern diesels a much nicer drive because of it. Explained simply, a dmf is a 2part flywheel with a shock absorber between the 2 so might fail eventually, which a solid flywheel won't.

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