My money saving tip:
Don't run your car on veggie oil, no matter what everyone says.

This is because it ruins your injection pump and clogs the injectors up.

Some cars are OK on it (I used to run a Vauxhall Cavalier on the stuff, and that was seemingly OK, until I noticed it losing progressively more power as the miles rolled on).

I remember hearing a few years ago that mechanical injection diesels with the Bosch injection pump are probably OK on it - but that's definitely not a hard and fast rule. Definitely don't try it in cars with common rail fuel injection as it will cause instant fuckage.

I mean seriously. Diesel: £1.40/l. New fuel system: £thousands. What's more economical here?
(Flap Burger hasn't really got a burger made of flaps, Tue 15 Nov 2011, 9:01, 4 replies)

my wife ran her Seat Ibiza Diesel on cooking oil fine
Believe it or not cooking oil brand new from the shops is cheaper than diesel per litre !!
The only issues we had were the in line fuel filters becoming blocked quicker but these were easy to replace.

As for recycling used cooking oil
that i have always thought is too much work
time and dangerous equipment for too little a gain.
(Cov Boy, Tue 15 Nov 2011, 9:54, closed)

Well, it'll work OK in some cars...
...but even then, it's still not exactly good for it.

The fuel system is designed to pump diesel, and that's a lot thinner than chip oil, whether new or used.

Even Biodiesel's not good, though I'm not quite sure why.
(Flap Burger hasn't really got a burger made of flaps, Tue 15 Nov 2011, 11:57, closed)

I read once that the diesel engine was originaly designed for use with bio fuels but the advent of ww2 meant diesel was easier and quicker to source and stayed that way ever since. But then they never had our government raping them on tax in those days...
(Beaverman Opulence, I has it., Tue 15 Nov 2011, 13:57, closed)

Some cars run fine on veggie oil some don't. It's often down to the fuel pump seals.

Anyway veggie oil can pick up a lot of sludge and flaky bits in the fuel tank and so the fuel filter should be changed more often.

My old Land Rover had a 300TDI engine and was run on 50/50 veggie oil for many years without any problems.
( Vambo, Tue 15 Nov 2011, 12:45, closed)