vegetable oil and mot.

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Carrington224 said:
I'm not comfortable with adding petrol to fuel for a diesel engine and I can't see it cleaning the combustion chambers.
And I believe using mineral oil as fuel falls foul of HMRC as it attracts fuel duty.
I can't see that used engine oil, unless well centrifuged would be good for the injector pump and the engine.
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years back in series days in winter used to add 1 gallon petrol to 6 of diesel to stop it waxing up , never suffered any damage .
 
leeby7 said:
used engine oil! are you taking the ****? how does it run on it?
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No p!ss being taken here. The millitary have been doing it since WWII. Just let it stand for a month or so, filter any lumps, and thin to something like diesel consistency with petrol or parafin. So long as you pre filter so it dont clog your on board filter you're good to go. The black colour is only carbon which acts a bit like the lead in petrol back in the day.
The TD5 dont have an injection pump so it just loves any flavour of oil. Its what it was designed for. Used engine oil is normally free as garages have to pay to get rid. Here endeth the lesson.
 
Carrington224 said:
I'm not comfortable with adding petrol to fuel for a diesel engine and I can't see it cleaning the combustion chambers.
Never add more than 10% petrol - ever. You'll burn your valves away and get serious pre ignition. Where possible use stale petrol as its less volatile but still thins the oil. I use petrol/diesel mix sucked out of mis fuelled motors to thin as its free. The Scottish fishermen do it on their trawlers during winter as it gives easier starting and helps prevent gelling in extreme cold. They even add it to so called "winter diesel" which really just has heating oil added at the refinery. Ever watched Ice Road Truckers? They use 10% petrol for the same reasons.

And I believe using mineral oil as fuel falls foul of HMRC as it attracts fuel duty. What don't? If they were not so greedy then peeps would not try so hard to avoid fuel duty. If you invented a car that ran on cats p!ss the bar stewards would tax it.

I can't see that used engine oil, unless well centrifuged would be good for the injector pump and the engine. Centifuge is not necessary - you will never get the black out of it. It is fine carbon and which acts just like lead in petrol and burns away on ignition. It even lubes and quietens down your valve gear and stops diesel knock. Just filter down to 5-10 microns same as your on board fuel filter. This can be done with gravity filtering although its quicker when pumped. Dont know about injection pumps but TD5s dont have them which is why I love them. No fannying about with mechanical timing, variable fuel pressures, and diaphragms. So long as the oil burns under compression the diesel engine don't give a t0ss. TD5 injectors are great as they operate at pressures around 3300 bar or 49500 psi. Perfect atomisation every time. The first diesels were designed to run on peanut oil.
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Nobody is saying you have to try it but there are several thousand peeps saving good money out there with very little effort.
 
I know this thread is a couple of months old now but I am considering going down the veg oil route, we have a 90 with a 200tdi engine fitted, I have read a few threads about veg oil and some seem to be quite complicated and others you just bung the oil in the diesel tank? Can you just do this or do you have to have pre filters etc?

cheers

mandy
 
lcbandit said:
I know this thread is a couple of months old now but I am considering going down the veg oil route, we have a 90 with a 200tdi engine fitted, I have read a few threads about veg oil and some seem to be quite complicated and others you just bung the oil in the diesel tank? Can you just do this or do you have to have pre filters etc?

cheers

mandy
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The complicated additions are to prevent the veg oil clogging up the injectors/filter etc. Veg oil solidifies at a higher temperature and is thicker. If you mix it 50/50 in the summer there shouldn't be any issues and even in spring /autumn. As has been said you can go higher 75/25 or more. The complicated setups switch between diesel and veg oil allowing the car the start on diesel and warm up, then the veg oil is warmed up (using the hot water pipe from the heater) and this is passed through a filter (just as diesel is) but the filter is heated to in order to prevent clogging. The veg oil then goes through the system just as diesel would and gets burnt. About 2 minutes before you get to your destination you switch back to the diesel tank and so the diesel "cleans out" the system of veg oil and when you start again you are starting on pure diesel. Using this technique you can run 100% veg oil for maybe 9-10 months of the year and during the height of winter you might have to thin it to make sure it comes out of the tank using petrol/parafin/diesel. I had planned to fit a TD5 rear fuel tank to my 90 in order to go down the dual fuel route but as yet I've still not found one! It's still a plan though.
 
100% veg for me, never had an issue, this time of year i chuck in a bit of diesel like 35% never an issue starting! did run waste engine oil once, filtered down to one micron, hmmm thats another story, not a great one at that! however veg oil bang it in and drive! ive been at it for years! only had a couple of engines go boom =) but that wasnt really fuel quality related, that was through overboosting/Fuelling ;)
 
so basically i can keep my engine oil, let it stand, dilute with no more than 10% petrol or paraffin, filter and sling it in the tank?

what about all the diff oils etc? can i just sling it all in together?
 
I tried the old engine oil thing in my 200tdi. Filtered it through 15, 10, 1 micron filter bags. Thinned with petrol to diesel consistency. Ran a dream for 2 days. Thought I'd found the holy grail. Then the smoke started. Nightmare. Fuel tank off and cleaned. Flushed system as well as possible with clean fuel, and injector cleaner. New filter. Better, but still smoking slightly. Never a bit of smoke prior to this wee experiment. :(
 
meego said:
I tried the old engine oil thing in my 200tdi. Filtered it through 15, 10, 1 micron filter bags. Thinned with petrol to diesel consistency. Ran a dream for 2 days. Thought I'd found the holy grail. Then the smoke started. Nightmare. Fuel tank off and cleaned. Flushed system as well as possible with clean fuel, and injector cleaner. New filter. Better, but still smoking slightly. Never a bit of smoke prior to this wee experiment. :(
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I had same results!!! NEVER AGAIN!!!!
 
J.P.S said:
I had same results!!! NEVER AGAIN!!!!
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Suppose it was worth a go though, judging by others results. I done quite a bit of homework on internet and it looked good. Lots of good sites with Americans using it. But for me....No.
 
Also been looking to using veg oil in my 200tdi, from my understanding, the twin tank setup is best if doing longer trips but not as good if only doing short average drives due to the system needing to be heated before switching over to the oil.

Although a lot of others seem to have very few issues using a single tank and mixing method.

Seen other threads of people saying they have built the twin tank setup for less than 150£, depends what you have laying around really....
 
meego said:
I tried the old engine oil thing in my 200tdi. Filtered it through 15, 10, 1 micron filter bags. Thinned with petrol to diesel consistency. Ran a dream for 2 days. Thought I'd found the holy grail. Then the smoke started. Nightmare. Fuel tank off and cleaned. Flushed system as well as possible with clean fuel, and injector cleaner. New filter. Better, but still smoking slightly. Never a bit of smoke prior to this wee experiment. :(
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The TD5 has much higher injection pressures than a tdi so the fuel is much better atomised so ignites easier and burns more completely. Later TD5s run injection pressures of 3300 bar or about 48,00 psi. I dont use engine oil any more as I was having trouble getting rid of the sludge after filtering. I now use SVO @ 76p/litre from Costco with no issues. Well worth the £24 annual membership fee. Its just a shame my Scooby is not a diesel.
 
So I can just mix it with my diesel traight into the tank then and not have to do anything with it? I'm liking that option, if I can, as having to have 2 tanks etc is far too much messing for me! lol I would probs want to do the odd long journey but they would be far and few between, I have a friend with a costco card so can get the stuff cheap enough.
 
J.P.S said:
:) so many people who don't realise how easy it is, how many threads on here? And peeps still ask . . . .
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I like to double n triple check I'm gonna be doing it right so I don't break anything lol and I've gotta convince my son is a good idea too! ! ;)
 
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