The maintenance of the car covers many elements beyond the common oil change and filter. Many other parts wear out over the life of the car, and proper maintenance often prevents costly breakdowns to a great extent.
The engine overhaul is the most common maintenance that is usually done on cars every certain period of kilometers. In both cases, the oil and the different filters are changed, but the main differences focus on the constant change of the fuel filter in the case of Diesel , while in Gasoline engines this filter is secondary.
In diesel , their periodic replacement is very important since the high-pressure direct injection systems, as well as the injection pumps, are elements of extremely high mechanical precision and a very high cost of repair or replacement. So make sure with each change of fuel filter that the injection circuit will not reach impurities that could damage the system, it is vital to ensure its longevity and correct operation.
Continuing with Diesel engines, each check should check the glow plugs or glow plugs, which preheat the fuel to help the engine start correctly.
Gasoline engines, on the other hand, require periodically checking the thickness between the spark plug electrodes, in order to ensure a correct spark gap and therefore a correct engine operation. In case of not presenting a correct appearance, the entire set must be replaced. Also, check that they are not encrusted with oil residues or charcoal.
Regarding the types of oil used, the most modern Diesel engines are equipped with Anti-Particulate Filters, so the oil must be specific for this type of system and have the approval of the vehicle manufacturer.
On the other hand we have the engine belts, both the Accessories and the Distribution belts. In the case of accessory belts, maintenance does not differ depending on the type of motor. It is usually replaced together with the timing belt or in case of disassembly for an intervention. In any case, if it shows abnormal wear or cracks it must also be replaced.
In the case of timing belts, things already differ much more. In the older Diesel engines, their replacement had to be done between 90,000 and 120,000 km, while today thanks to Common Rail technologies their life is extended until after 200,000 km, even being changed every 240,000 km. In the case of gasoline engines, its replacement is still recommended between 120,000 km and 150,000 km, depending on the manufacturer. In the event that the distribution was controlled by a metal chain, there are no maintenance differences between different types of engines.
In the case of anti-pollution systems, the maintenance of a Diesel is far superior to that of a Gasoline. As we previously explained, Diesel engines equipped with Particulate Filters eventually end up blocking said filters, which is why some manufacturers require a special additive that, when injected together with the fuel, “burns” these residues and thus cleans the Anti-Particulate Filters. This additive liquid must be refilled every certain time, depending on whether the use of the vehicle is mostly urban or mixed.
Another aspect of diesel maintenance is cleaning the EGR (Exhaust Gases Recirculation) valves or the recirculation of exhaust gases. This system derives part of the exhaust gases from the engine back to the intake to be re-burned and eliminate a small part of the solid particles, but consequently these valves eventually fill up with carbon, clogging and causing erratic operation. engine, so cleaning it every 100,000km (or less if it works on an urban cycle) is highly recommended.
For their part, gasoline engines do not require special attention in anti-pollution systems, although due to the nature of the exhaust gases and their reaction with the condensation of ambient humidity that occurs in the exhaust, it can corrode and break.
After seeing the differences in the engine, we will move on to the transmission. The clutches of cars with Diesel engines tend to tire less and last longer, since the very high torque offered by these engines means that we have to change gear less often, use less of the clutch. And, above all, when starting from a standstill, we do not need to rev the engine so much to get the car moving.
Due to the opposite effects, the clutches of a gasoline engine tend to last fewer kilometers. In contrast, Diesel cars and their clutch systems have other maintenance. The so-called dual-mass engine flywheels. They tend to break much earlier in a Diesel than in gasoline, since, as we mentioned, the bulky engine torque of a diesel makes this element of the transmission work much more intensely.
Maintenance of the braking system
Finally, the braking system also requires different maintenance depending on the type of engine the car uses. Since Diesel engines weigh more, cars with these engines tend to be a few kilos above those of Gasoline, so the braking force must be higher and therefore, the wear of discs and pads, in the long run, is higher in a Diesel than a Gasoline.