FAQ

A high Base Number (BN) is crucial because it indicates the oil’s ability to neutralize acidic by-products formed during fuel combustion, protecting engine components from corrosive wear. At the same time, a low ash content - such as found in Aurelia NGX 40 -  is essential to minimize deposit formation on pistons and in combustion chambers, which helps maintain engine cleanliness, prevents ring sticking, and ensures optimal performance. The right balance of high BN and low ash ensures both effective acid neutralization and reduced deposit-related issues, extending engine life and reducing maintenance needs.