ozzyboydeano said:

you see manufactures of stabilising oils has been well looked into and allot of research to be more refined unfortunately there is cost ..adding in small amount of petrol like the old days into a diesel may work ..what about long term affects? ........welcome from a guy who works with injection systems

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Half a litre per tank should not do any harm what so ever used over cold season. Not that I do that since there are other additives nowadays. That amount should prevent gelling. The conversation about the petrol started by the question that maybe I had some petrol in the tank and my point was that no i don't but even though I would have it wouldn't really matter since you can have quite a bit of it in the tank and experience no symptoms.

Recently one landy in our town was filled by accident with petrol on top of maybe a half full or less tank of diesel. That Landy still ran over 100 miles before it began bugging, and still after that they were able to just by replacing the fuel with new diesel restart and begin the tour with no issues.

So yeah, it's not the best option and probably kills your milage due to different heat production, but it used to be the only option to prevent gelling before other additives came around and the engine will run problem free with something like 1:150 petrol to diesel.

northernbobber said:

Half a litre per tank should not do any harm what so ever used over cold season. Not that I do that since there are other additives nowadays. That amount should prevent gelling. The conversation about the petrol started by the question that maybe I had some petrol in the tank and my point was that no i don't but even though I would have it wouldn't really matter since you can have quite a bit of it in the tank and experience no symptoms.

Recently one landy in our town was filled by accident with petrol on top of maybe a half full or less tank of diesel. That Landy still ran over 100 miles before it began bugging, and still after that they were able to just by replacing the fuel with new diesel restart and begin the tour with no issues.

So yeah, it's not the best option and probably kills your milage due to different heat production, but it used to be the only option to prevent gelling before other additives came around and the engine will run problem free with something like 1:150 petrol to diesel.

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i understand you dont have any petrol in your system
but didnt you say

Here in cold north we sometimes add petrol to diesel to run them in extreme cold temperatures if winter diesel is not available and they run fine with a few litres of petrol per tank.

petrol may stop diesel from gelling up but its also a solvent
yes the engine may run well but you are shaving off the the life span on injection system components as the diesel is also a lubrication before being a fuel source

where is kerosene wont break down the properties of diesel most popular choice used

If nothing else is available petrol is the way to go and before it was the only option. Now usually you will find other additives. No issues with cars thet has run for decades with petrol added though. Some premature wear plaussible, something to worry about... no

ozzyboydeano said:

i understand you dont have any petrol in your system
but didnt you say

Here in cold north we sometimes add petrol to diesel to run them in extreme cold temperatures if winter diesel is not available and they run fine with a few litres of petrol per tank.

petrol may stop diesel from gelling up but its also a solvent
yes the engine may run well but you are shaving off the the life span on injection system components as the diesel is also a lubrication before being a fuel source

where is kerosene wont break down the properties of diesel most popular choice used

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I don't know about Finland, but never add kerosene to diesel in the UK as it is not a road fuel and VOSA inspectors can easily detect it if you are pulled in at a checkpoint. The same applies to adding waste engine oil, fuel duty is not applied at point of sale. The only safe oil to add to diesel is 2-stroke oil, that since it is a fuel for motorbikes, has duty applied. You can of course mix vegetable oil, but that can cause problems.

v8landyman said:

I don't know about Finland, but never add kerosene to diesel in the UK as it is not a road fuel and VOSA inspectors can easily detect it if you are pulled in at a checkpoint. The same applies to adding waste engine oil, fuel duty is not applied at point of sale. The only safe oil to add to diesel is 2-stroke oil, that since it is a fuel for motorbikes, has duty applied. You can of course mix vegetable oil, but that can cause problems.

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i was born in the UK we used red diesel in some of our engines being in the refrigeration and trucking game as well as a agriculture ....still never needed to put petrol or kero into diesel as the winter temps are no where near as finland ...... i ran my vauxhall for many years on red with out issiues running the gauntlet LOL
however some engines like the 4jx1 and some cat engines that have a heui injection system did suffer in the uk in winter..... only reason being the injectors will only enable with the correct oil pressure as they need very high oil pressure to crack off so the correct grade oil was crucial

2 stroke oil wont help diesel from gumming up in very cold temps ..... adding in 2 stroke is only for extra lubrication properties
depends on how deep you go using bio fuel ..here in australia they run there engine on diesel to operating temps then flick over to chip shop oil with extra heat exhangers installed

ps stay away from waste oils from work shops there will be a blend of ATF fliud