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Old 20th March 2022, 09:24   #1
Bazzateer
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Default Diesels and veggie oil

Just curious, does anyone know if the MGR BMW derived diesels will run on vegetable oil without any mods?

Edit: Ignore, just realised they're common rail so it's a no.

Last edited by Bazzateer; 20th March 2022 at 09:28..
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Old 20th March 2022, 17:38   #2
Kearton
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Quote:
Originally Posted by Bazzateer View Post
Just curious, does anyone know if the MGR BMW derived diesels will run on vegetable oil without any mods?

Edit: Ignore, just realised they're common rail so it's a no.
For the curious, please could you explain why it being a common rail design makes a difference?
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Old 20th March 2022, 18:29   #3
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Originally Posted by Kearton View Post
For the curious, please could you explain why it being a common rail design makes a difference?
I don't know the specifics, just that common rail diesels don't play well with veggie oil. Older direct injection ones fare better I believe.
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Old 20th March 2022, 21:36   #4
coab
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My friend ran his R75 on a mixture of diesel and veggie oil. Didn’t have any problems in 30k miles. He only used new oil not used oil. 😉
Modern engines are a different kettle of fish but the older ones are fine. The old story was if unsure add a few litres to a full tank and if it works fine gradually build up your confidence and add more over time.
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Old 21st March 2022, 11:07   #5
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I looked into this many years ago. It puts too much strain on the high pressure fuel pump.
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Old 21st March 2022, 18:52   #6
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I think the issue is viscosity so some people used to fit a pre-heater
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Old 21st March 2022, 19:00   #7
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My old B4 Passat had the 1Z engine and loved fresh veggie oil. It had an 80l tank so I would buy 3 x 20l jugs of fresh oil from Costco for 55p/litre and fill it up, then top up with about 10l of diesel (which was about £1.30/litre at the time).
Ran smoother and quieter. 55+mpg. Smelt great. Only issue was in sub-zero temps when it would take a few extra seconds to start.
Only sold it because I accidentally bought an E36 320i Touring.
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Old 21st March 2022, 19:04   #8
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I remember when it was that cheap but also when it went up over a pound a litre (wonder if that was related to people using it as fuel lol) so the difference in price with diesel wasn't all that. Now seems like an interesting proposition ...
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Old 23rd March 2022, 14:58   #9
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Be interesting to hear of anyone using veg oil in a 75 and what sort of combination, ie: 50/50 veg/diesel ??
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Old 23rd March 2022, 18:25   #10
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Used to run my old Rover 600 diesel on used veggie oil , hardest part was filtering all the old bits of chips out of it !
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