NAVIGATION
SOCIAL
OFFICE ADDRESS 5A Abbey Road Grimsby, DN32 0ES England
CONTACT Phone: 01472 867070
© 2019 The Business Support Service Ltd
LEGAL
Major Cards Accepted

I've put some diesel in my petrol car by mistake will it do any damage? What is a safe amount?

It depends on what you mean by 'some diesel'. As a safe amount the industry generally accepts 5% or less of diesel in petrol is OK. 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 01472 867070 for free advice or google your vehicles tank capacity but do be careful as the tank capacity can vary by year, model of car and engine size. If you have gone over the safe amount the likelihood of damaging your engine is minimal as diesel is a less aggressive contamination but that doesn't mean it's OK to put more in than the safe amount. If the engine will start then it will be strained as the diesel in a hot engine will combust too soon and the engine will run hotter than designed and potentially damage the pistons etc. If this pre-ignition (pinking) is occurring get it sorted immediately and do not undertake any long journeys or travel above 30mph. Self imposed limp mode and seek help as soon as possible is the best advice.

Safe Amount of Diesel in a Full Tank of Petrol

Fuel Tank Capacity (litres)
Safe Amount (litres)
Small Cars and Hybrids
Medium cars
Large cars and Vans
30
1.50
-
-
35
1.75
-
-
40
2.00
-
-
45
2.25
-
50
2.50
-
-
55
2.75
-
-
60
3.00
-
65
3.25
-
70
3.50
-
-
75
3.75
-
-
80
4.00
-
-
Depending on the quantity of the wrong fuel, exceeding the safe amount will at least cause one or more of the following symptoms: Prevent the engine starting easily from cold Loss of power Rough idling Engine will stop after a short distance and not start again Cause the engine to run on after the ignition has been turned off (Pre-ignition) At worst being able to drive with too much diesel in the petrol will cause: Pre-ignition or engine knock which if not cured can lead to - Damaged pistons, valves, crankshaft and bearings Contaminate the catalytic converter in the exhaust system and need to be replaced
© 2019 The Business Support Service Ltd
NAVIGATION
SOCIAL
OFFICE ADDRESS 5A Abbey Road Grimsby, DN32 0ES England
CONTACT Phone: 01472 867070
LEGAL

I've put some diesel in my petrol

car by mistake will it do any

damage? What is a safe

amount?

It depends on what you mean by 'some diesel'. As a safe amount the industry generally accepts 5% or less of diesel in petrol is OK. 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 01472 867070 for free advice or google your vehicles tank capacity but do be careful as the tank capacity can vary by year, model of car and engine size. If you have gone over the safe amount the likelihood of damaging your engine is minimal as diesel is a less aggressive contamination but that doesn't mean it's OK to put more in than the safe amount. If the engine will start then it will likely stop after a short while as the diesel is too cold to ignite and therefore wets the plugs and stops them from sparking. If there is enough heat in the hot engine and it continues to run the engine will run hotter than designed and potentially damage the pistons etc.
Depending on the quantity of the wrong fuel, exceeding the safe amount will at least cause one or more of the following symptoms: Prevent the engine starting easily from cold Loss of power Rough idling Engine will stop after a short distance and not start again Cause the engine to run on after the ignition has been turned off (Pre-ignition) At worst being able to drive with too much diesel in the petrol will cause: Pre-ignition or engine knock which if not cured can lead to - Damaged pistons, valves, crankshaft and bearings Contaminate the catalytic converter in the exhaust system and need to be replaced

Safe Amount of Diesel in a Full

Tank of Petrol

Fuel Tank Capacity (litres)
Safe Amount (litres)
Small Cars and Hybrids
Medium cars
Large cars and Vans
30
1.50
-
-
35
1.75
-
-
40
2.00
-
-
45
2.25
-
50
2.50
-
-
55
2.75
-
-
60
3.00
-
65
3.25
-
70
3.50
-
-
75
3.75
-
-
80
4.00
-
-

I've put some diesel in my petrol car by mistake will it do any

damage? What is a safe amount?

It depends on what you mean by 'some diesel'. As a safe amount the industry generally accepts 5% or less of diesel in petrol is OK. 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 01472 867070 for free advice or google your vehicles tank capacity but do be careful as the tank capacity can vary by year, model of car and engine size. If you have gone over the safe amount the likelihood of damaging your engine is minimal as diesel is a less aggressive contamination but that doesn't mean it's OK to put more in than the safe amount. If the engine will start then it will be strained as the diesel in a hot engine will combust too soon and the engine will run hotter than designed and potentially damage the pistons etc. If this pre-ignition (pinking) is occurring get it sorted immediately and do not undertake any long journeys or travel above 30mph. Self imposed limp mode and seek help as soon as possible is the best advice.

Safe Amount of Diesel in a Full Tank of Petrol

Fuel Tank Capacity (litres)
Safe Amount (litres)
Small Cars and Hybrids
Medium cars
Large cars and Vans
30
1.50
-
-
35
1.75
-
-
40
2.00
-
-
45
2.25
-
50
2.50
-
-
55
2.75
-
-
60
3.00
-
65
3.25
-
70
3.50
-
-
75
3.75
-
-
80
4.00
-
-
Depending on the quantity of the wrong fuel, exceeding the safe amount will at least cause one or more of the following symptoms: Prevent the engine starting easily from cold Loss of power Rough idling Engine will stop after a short distance and not start again Cause the engine to run on after the ignition has been turned off (Pre-ignition) At worst being able to drive with too much diesel in the petrol will cause: Pre-ignition or engine knock which if not cured can lead to - Damaged pistons, valves, crankshaft and bearings Contaminate the catalytic converter in the exhaust system and need to be replaced
SOCIAL
OFFICE ADDRESS 5A Abbey Road Grimsby, DN32 0ES England
CONTACT5 Phone: 01472 867070
© 2019 The Business Support Service Ltd
LEGAL
Major Cards Accepted
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Fuel Drain Specialists 01472 867070