95 or 98 gasoline, normal or plus diesel: what fuel should I choose?

95 or 98 gasoline, normal or plus diesel: what fuel should I choose?

A gasoline car could use both types of octane ratings indistinctly, but each type of fuel is designed for specific engines, so its indiscriminate use could have negative consequences either for the engine, or for your pocket. But nothing compared to putting gasoline in a diesel or vice versa.

If the engine is designed to run on 95 octane gasoline but I put 98 gasoline on it: you may not notice any difference in performance and the only thing you will get is paying more to fill up the tank. On the other hand, if the engine is designed to run on 98-octane gasoline but I use 95-octane gasoline: you will notice a reduction in performance and even an increase in consumption.

So, is one gasoline better than another? No. It depends on the use and the vehicle to which it is directed.

And in diesel the difference between normal and plus is marked by the amount of cetane. The greater its quantity, the shorter the time between the injection of diesel and the start of combustion. Diesel plus is more efficient especially when the engine starts, being cold. It also contains less sulfur and incorporates additives with anti-corrosion properties. But in any case, as with gasoline, you should always use the diesel indicated by the manufacturer in the vehicle manual and on the tank cap.

Can it be mixed?

When the manufacturer indicates to use 95 gasoline, putting 98 octane will not have any benefit for the engine. The same as using 95 in an engine adapted for 98, increasing consumption and emissions as the default parameters of the ECU control unit are altered. Mixing both gasolines does not have negative consequences if we do it on time, according to the DGT, because we have made a mistake or the one we need at the refueling point is exhausted.

But if it is done regularly, it would end up harming the operation of the engine. Alternately refilling 95 and 98 gasoline to clean the feeding system and the injection, as we have heard at some point, does not make sense. Today, 95 gasoline enjoys the same quality standards as 98 octane. So if the 95 is recommended, it makes no sense to use the 98. In this way we will reduce consumption and limit the emissions of polluting particles.

In the case of diesel, unless the car is old, according to Repsol on its website, there is no problem. The difference in viscosity that normal diesel presents favors the lubrication of the different parts of the engine, which improves its durability. And, although premium diesel offers a number of positive properties, the real characteristics of the car must be taken into account for it to provide any benefit.


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