Soldato
- Joined
- 27 Mar 2013
- Posts
- 9,574
Topping up your petrol car with 50% diesel increases torque output by 25%. Everybody knows that.
But its only usable in the top 500 revs

Topping up your petrol car with 50% diesel increases torque output by 25%. Everybody knows that.

The answer depends on what type of engine and fuel system it is.
If it has a high pressure pump (common rail) get it drained, these pumps are already running at the minimum level of lubrication required and adding petrol drastically reduces the lubricity of the fuel.
If it's an older and non-CR car, I'd just add a litre of 2 stroke oil and top off with diesel - if you don't really care, you could also do this on a common rail engine and take a gamble..
What year/car /engine is it?
Its a 2008 Zafira cdti 150!
2.2 lump? I'd just go for adding a bottle of 2 smoke then.
Its the 1.9 engine. I personally think he was potty driving it home but still!
Horrible engine, but would i be right in thinking this is one of the older diesel engines? The older ones have a better resistance to petrol in the tank!
How could you even put petrol into a truck?A Mate did this to an HGV, Common Rail Scania R480, it ran without issue for another 100k KM and then lunched its engine when its turbo failed.
Difficult if not impossible to say if the 100ltr of petrol he'd put in it was the cause (it had 800 litre tanks) but the end bill was the far side of £20k!

Petrol in diesel? Most likely fine at that ratio. As mentioned 25% petrol to diesel to stop it freezing in sub zero environment is not uncommon.
If it were the other way around (diesel in petrol), different story.
How could you even put petrol into a truck?
There are special pumps for truck diesel![]()

He'd filled it up at a small garage without a dedicated HGV pump and must have picked up the unleaded pump by mistake, I presume he's colour blind!!
Truck Drivers seem able to manage / mangle all kinds of things....
Another common one with Scania & Volvo trucks is to find some numpty has put screen wash in the brake fluid reservoir!!
Well at least your brakes would be squeaky clean on the inside.

As it happens I did this to a 57 plate Astra cdti 1.9 150 once many years a go.

Sounds like you should get better labels on the tank lids![]()
http://i290.photobucket.com/albums/ll244/promomaker/red_bull_car_driver_job.jpg[/IMG[/QUOTE]
Given that is obviously a red bull livery on the car this is probably a publicity stunt and the stuff in those cans isnt what it seems :p