Petrol, diesel and hybrid vehicles have very different maintenance needs, which lots of people don’t think about when booking their cars for a standard service. Essentially, the kind of fuel a car runs on determines which parts wear out the fastest, which fluids get dirty the quickest, and which components are tested the most during an annual check-up. So knowing about these things will help car owners ensure their cars get the right treatment rather than a one-size-fits-all approach that may not meet the car’s essential needs.
Diesel Vehicle Servicing Differences
The basic difference to note here is that diesel engines get ignited under much higher compression or pressure than petrol engines. This means that they can create much higher pressures during the combustion of the fuel. This difference leads to the need for diesel engines to get a well-targeted maintenance service, which may not be as easily available as a regular one.
Diesel Particulate Filter Maintenance
The diesel particulate filter is a device that catches the particles produced during the combustion of the fuel. This is then removed by a regeneration cycle that involves burning the collected particles at a very high temperature. Breaking down the regeneration process while driving around the city for short distances is the main cause of the filter getting overloaded with more and more particles beyond the limit. In case of a completely blocked filter, the warning light on the car will show up, and there will be quite a noticeable drop in the performance of the engine. When the blockage level is such that the vehicle system can no longer deal with it by active regeneration, then getting the vehicle cleaned by a professional or replacing that part is the way out. Getting a car servicing Stourbridge also means a specialist garage that, apart from general diesel servicing, will also take a look at the diesel particulate filter.
EGR Valve Carbon Build-Up
To help reduce combustion temperature, thereby effectively lowering nitrogen oxide emissions, the exhaust gas recirculation valve redistributes some exhaust gases again into the intake manifold. If exposed for a long time, a lot of carbon deposits can get built up both on the valve and the adjacent passages. An EGR valve getting stuck or blocked leads to the car idling roughly, less power, and more fuel consumption. During the service, the valve and its vicinity can be cleaned in order to stop further accumulation from going on to the level at which replacement would be the only option.
Petrol Engine-Specific Maintenance
Petrol engines focus more on a different range of components as compared to diesel units. In fact, quite a few components depend on mileage-based replacement intervals that can differ from one manufacturer to another.
Replacement of the oxygen sensor
It is the job of oxygen sensors to sense the makeup of the exhaust gases and pass the data to the engine control panel. This way, the engine management system will use the data to calibrate the fuel mix. In case of a malfunction, it will provide inaccurate data, which may cause an overload or underload of the engine with fuel. Additionally, the car will show lower performance and increased pollution. Generally speaking, a change of the oxygen sensor for a gasoline car needs to be done when the car reaches the mileage of 60,000-100,000 miles, depending on the type of the sensor and instructions of the manufacturer.
Cleaning of the Throttle Body
The throttle body is the component that regulates the amount of air going into the engine. Over time, carbon gets deposited on the throttle plate and in the throttle body bore. These deposits not only reduce the airflow but also make the engine idle at low speed in a very unstable manner. By cleaning the throttle body during the vehicle's servicing, one can bring back the air flow to its normal level and also speed up the throttle response without even needing to get the component replaced.
What Annual Testing Examines Beyond the Basics
The yearly roadworthiness examination includes several items that drivers with ageing or high-mileage vehicles need to focus on before their test date.
Effectiveness of the Catalytic Converter
The actual test is based on measuring the emissions levels and comparing these to the limits allowed for the vehicle, depending on its age, type of fuel, and engine type. A vehicle with a catalytic converter that has failed only partially may still be able to start and run under normal conditions. However, it is likely that it will still emit pollutants in excess of the allowed levels. Such a situation would lead to a failure in the test, and the only way the vehicle could be certified again would be after the converter has been replaced. Drivers who are preparing to do the professional MOT Stourbridge test at the authorised centre also get an emissions test which is conducted as per the DVSA rules for the concerned fuel type and registration year.
Brake Imbalance on Older Cars
Most older vehicles develop a brake imbalance along an axle because of a sticking calliper or the pads wearing unevenly, and the latter happens very slowly over time. By using the rolling road brake tester, the braking force can be measured separately at each wheel, and the percentage difference between the two sides can be obtained from the reading. If the brake imbalance is more than 30 per cent on any axle, then it is a failing point irrespective of the overall braking efficiency.
Pre-Service Checks Worth Completing
Before scheduling a service or an annual test, drivers can deal with several very simple things.
- Firstly, if there are any warning lights that have been checked off but not thoroughly investigated, the vehicle's test results are directly affected by such situations, so drivers should pay attention.
- Secondly, if fuel consumption has changed for the better or worse, it might be due to a faulty sensor or a dirty filter that should be cleaned or replaced during servicing.
- Thirdly, any new noises when the engine is at the lowest revs should be checked since they are usually related to malfunctioning EGR valves or throttle bodies and relevant repairs or replacements.
- Fourthly, checking the last service date will not only indicate when the vehicle was last serviced but, combined with the vehicle's fuel type and mileage, will also ensure that the time between services is the right one.
Conclusion
The kind of fuel used by a vehicle dictates different servicing and testing needs than a one-size approach can. Both diesel and petrol engines possess unique parts that become less effective in different ways and require different attention during servicing and testing. Recognising these would help drivers proactively communicate with service staff at the time of booking. It would also make sure that the garage has both the skills and the tools to handle the vehicle's needs effectively, rather than just doing the standard test or service.
