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2 stroke oil in diesel engines


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It was useful to add lubricity when sulphur content was reduced, but since the inclusion of ~5% bio-diesel in fuel stocks is now not necessary and was only then relay required for DERV as red still had much higher sulphur/ash content then DERV

 

Now red is moving to the same sulphur content as DERV and includes ~5% bio-diesel in fuel stocks it is not needed.

 

If you wish to add oil you are better with adding ATF periodically as it acts as an injector cleaner but its not a good idea to put it in DERV due to the HMRC not liking it as it dyes the fuel red (though it doesn’t have a chemical marker as per red diesel)

 

The biggest problem was there is 3 types of red diesel of which the lest common one (ultra low sulphur city gas oil) is the only one that conforms to BS EN590 which is the same as DERV from the garage pumps with a guaranteed cetane number >51, your normal red diesel only has a guaranteed cetane number >46 & marine gas oil a guaranteed cetane number >35

 

Higher cetane numbers = a shorter delay between the start of injection and the start of combustion, hence when something has its injector pump set up for DERV and you put red in it it smokes more and has a little less power then it would if you set the injector pump timing for red, going the other way there is little or no effect I.e. putting DERV in something set for red diesel.

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