Diesel versus LPG versus CNG versus Petrol



MarineDiesel offers many different engines that can easily be customized to meet our customers’ requirements, industrial or marine applications, either on a project basis, or a ready-to-install solution. As environmental and economic constraints often determine the type of engine or power package offered, the critical constraint is usually a tradeoff between regulatory compliance and cost of operation.

Different engine blocks offer different options. Sometimes, an engine must be converted at the factory, using a kit (such as our larger diesels), or an engine may be easily adapted (such as in the case of most of the GM Vortec line).

Alternative fuels also each have advantages and disadvantages. This article will offer comparisons between Diesel, LPG, CNG, and Petrol, at a glance:

Petrol Advantages:

  1. Good power and acceleration.
  2. Better cold weather operation. No fuel line heater required.
  3. Usually less expensive than other engines.
  4. Low Maintenance.
  5. Low Noise.
  6. High availability.


Petrol Disadvantages:

  1. Greater fuel consumption than other fuel types.
  2. Price of fuel is usually higher.
  3. Emissions control required in many jurisdictions.
  4. Lower safety due to fire / explosion risk.


Diesel Advantages:

  1. Lower maintenance costs.
  2. Efficient combustion. Greater power output than other fuel types.
  3. Common fuel availability.
  4. Less expensive than petrol (Generally).


Diesel Disadvantages:

  1. Slower Acceleration than petrol.
  2. Noise.
  3. Cold weather requires heating.
  4. Emissions control necessary. Ultra low sulphur diesel mandated in many markets.


CNG Advantages:

  1. Cheapest fuel based on power output.
  2. Very low emissions.


CNG Disadvantages:

  1. Expense of conversion.
  2. Lower acceleration.
  3. Fuel availability is often restricted / unavailable.
  4. Time to fill tanks can be problematic.
  5. Engines tend to be heavier.
  6. Explosion risk (Higher insurance)
  7. Freezing of fuel lines in hot climates can be problematic. Higher maintenance.


LPG Advantages:

  1. Much cheaper than petrol or diesel.
  2. Low emissions.
  3. Portability of fuel.


LPG Disadvantages:

  1. Tank sizes can be problematic.
  2. Availability in some markets is lacking.
  3. Freezing fuel lines in hot climates.
  4. Expense of conversion.
  5. Inability to use all fuel in a tank (due to pressure)
  6. Higher maintenance.