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Since I used oil additive in Honda Concerto 1.5 d15b2 with worn synchronizers , and gears stops grind 300 km after using it, I use oil additives in my cars. However most of them do not work, are sneak oils etc.

I tested many engines, and if engine takes a lot of an oil, then compression can gain 10-15%. For instance engine with good meintance will have 13 bar. If the engine will have medium wear then compression can be 9-12 bar but when then engine consume a lot of oil , then the engine can generate...

I have a good results with ceramic oil additives, espcially on gearbox.

Mobil 1 5W50 - most professional tuners in Poland suggest that engine oil. This oil has very good opinion here in Poland.

Ceramizer (ceramic oil additive) in Megane 1.9 dci

It is very difficult to measure fuel consumption. Most fuel consumption reduce is correlated with some engine rebuild (engine compression gain) after adding engine oil additive to the worn engine. Exhaust emission do not tell the real fuel consumption.

Most oil additive works with aluminium as well, but it takes more time to build anti friction coating at aluminium surface than at steel surface.