I spent the last month (June 2025) testing the Metal Guard Engine product.
In May, I added it to the engine oil in my Skoda Scala car, which is equipped with a 1.5 petrol engine with 150 HP, operated by a DSG automatic transmission. This car is used for everyday purposes, so every month (except during holidays) it covers exactly the same routes, which consist of driving children to and from school, as well as shopping three times a week. In addition, there are occasional other routes, usually short ones. I only used the Metal Guard Engine additive for the engine, I did not use Metal Guard Transmission for the gearbox. I conducted the test in Spain on the Costa del Sol, which is quite important for the assumptions I will describe below.
The car is equipped with a factory-fitted Skoda system that monitors its performance, distance travelled, fuel consumption, etc. on a daily basis. I will present my conclusions based on these reports. I took as a basis the results from June 2025 – the first full month in which Metal Guard Engine was used in the engine – and June 2024, when I did not use Metal Guard. The comparison of these months is important because on the Costa del Sol, the turn of May and June is when the heat begins and there is more traffic due to the larger number of tourists. Both of these factors have a significant impact on fuel consumption, and comparing June 2025 to other months could be unreliable. Nevertheless, I will start by presenting the results from several other months, with a brief explanation.
1. October 2023, fuel consumption 6.7 litres per 100 km. Average speed similar to that achieved in June 2025.
2. December 2023, fuel consumption 6.9 litres per 100 km. Average speed similar to that achieved in June 2025.
3. August 2024, fuel consumption 6.8 litres per 100 km. Average speed slightly higher than that achieved in June 2025.
4. April 2025, the last full month without using Metal Guard. Fuel consumption 6.7 litres per 100 km. Average speed slightly lower than that achieved in June 2025.
A few words of explanation as to why these particular months. Between June 2024 and June 2025, there is a difference in the average speed that the car achieved in a given month. The above examples show that such a difference in average speed does not really affect fuel consumption, at least not to a noticeable extent.
Some more historical data:
The lowest fuel consumption achieved in a single day: 5.3 litres per 100 kilometres.
Average fuel consumption over the entire period of car use: 6.8 litres per 100 kilometres (6.775).
After using Metal Guard:
Lowest fuel consumption achieved in a single day: 4.8 litres per 100 kilometres.
Average fuel consumption in June 2025: 6.3 litres per 100 kilometres.
The graphs below show how fuel consumption changed each day in June 2024 and June 2025. I manually added a line to the graph from 06.2025 showing the average fuel consumption in June 2024 (6.9 litres per 100 kilometres) to show how the average fuel consumption changed compared to the period studied without using Metal Guard Engine.
As you can see, fuel consumption is about 9% lower when comparing June to June, which is significant because it is already a hot month and, compared to other months, the engine has to work a little harder as it also has to run the air conditioning at full power. For a 1.5 engine, this is a significant load, which is why I decided that a June-to-June comparison would be the most reliable. In addition, traffic increases in June on the Costa del Sol due to the larger number of tourists, which has an impact on driving smoothness and, consequently, on fuel consumption.
After the holidays, I intend to continue testing to see how my Skoda behaves with Metal Guard over a longer period of time, but based on the tests carried out so far, I can say that the use of Metal Guard Engine will reduce the operating costs of the car. I change the oil once a year, approximately every 15,000 kilometres. In my case, this should translate into savings of around 100-140 euros on fuel alone (I have already deducted the cost of purchasing Metal Guard), but if someone changes the oil every 30,000 kilometres, the savings will increase to around 250-300 euros. The larger and less economical the engine, the greater the savings from using Metal Guard.
Metal Guard also protects the metal components of the engine from wear and tear, which in the long run translates into further savings in terms of expensive engine or gearbox repairs, although I personally have no way of verifying this. Here, we will have to rely on the results of tests carried out by professional mechanics and engine designers, which should be available in the near future.
