What is a safe amount of Petrol in Diesel?
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I've only put a small amount of petrol in my diesel car, is it ok to drive if I top it up with diesel?

It depends on what you consider a small amount. As a safe amount some car manufacturers will say none though the industry generally accepts 7.5% or less of petrol in diesel is safe.

 

When you work it out for your tank capacity you will soon realise it's not a lot of the wrong fuel before it's too much. See the table below for a guide.

 

If you don't know your tank capacity then give us a call on 0330 2233 789 for free advice or google but do be careful as the tank capacity can vary within a particular model of car depending on engine size or whether it is a two wheel or four wheel drive version.

 

If your thinking of taking a risk it as it's only a little bit over the safe limit then don't. Recently a local motorist did just that. After topping up with diesel he then drove from Scunthorpe to York ending the journey in limp mode. The garage quote to repair the Audi Q4 was £7,500.

Safe Amount of Petrol in a Full Tank of Diesel

Fuel Tank Capacity (Litres)

Petrol in Diesel (litres)

Less than 7.5%

 

Vehicle size is a guide only

refer to the owners handbook

 

30

2.25

Small Cars

 

 

35

2.63

30 to

 

 

40

3.00

45 ltr

 

 

45

3.38

 

Medium Cars

 

50

3.75

 

45 to

 

55

4.13

 

60 ltr

60

4.50

 

 

Large Cars

65

4.88

 

 

and Vans

70

5.25

 

 

55 to

75

5.63

 

 

80 ltr

80

6.00

 

 

 

Older Diesels before 2001 may be safe with up to 10% - seek advice

Depending on the quantity of the wrong fuel, exceeding the safe amount will at least:

  • Cause loss of power
  • Cause rough idling
  • Prevent the engine starting from cold
  • Engine will stop after a few miles and not start again

 

At worst too much petrol in diesel can cause catastrophic failure due to:

  • Premature ageing of the fuel filter allowing particles to enter the HP fuel pump and injectors
  • The petrol eating away at fuel system seals and hoses causing leaks
  • Lack of lubrication (from the diesel) causing excessive wear or damage to the HP fuel pump
  • Injector tips prematurely aged or burnt

 

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