36 Why are modern engines so sensitive to oil change intervals? While some manufacturers have extended oil change intervals over the past two decades, today’s downsized, turbocharged and tightly engineered engines are far less forgiving when those intervals are exceeded or the wrong oil is used. Castrol explains why. A range of factors make modern engines particularly sensitive to oil condition. Turbocharging, direct injection, stop-start systems, hybrid operation and extended service intervals can all place extra stress on the engine, as well as on the lubricant. Short journeys can put a particular strain on oil and components because the engine oil may not exceed the optimum operating temperature (typically around 80-90°C) for long enough to evaporate any fuel and water contamination. Acids are also not fully neutralised and a build-up of sludge can occur. Hybrids can be especially challenging, because in some use-cases the combustion engine will run only intermittently, allowing more fuel and water to remain in the sump. Incredibly, some hybrid engines can stop, switch to electric and restart 500,000 times during their lifetime. That’s ten times more than a non-hybrid, and a direct consequence is that they can often run at cooler temperatures. Modern start-stop systems, such as those found in the majority of current petrol, diesel and hybrid models, save fuel but also increase the number of engine restarts and ‘lubrication events’ over the lifetime of the oil. Engine temperatures will rise and fall, potentially in quick succession depending on road or traffic conditions, leading to further strain. In addition, most engines today feature higher power outputs. For example, a modern 2.0-litre turbo engine may produce the power that required a 3.5- or 4.0-litre engine 20-plus years ago. Smaller cars, such as superminis and small family cars, have also often seen their engines downsized, with turbos used to ensure lively performance. This all means engines need to work harder, resulting in higher piston and turbocharger temperatures, and greater oxidative stress and deposit control requirements. Even though modern synthetic oils are significantly more robust, the engine environment has become more demanding. Official oil change intervals should, therefore, be treated as maximum recommendations for the right operating conditions, not universal guarantees. A car used mainly for long motorway journeys may suit the manufacturer’s full service interval. By contrast, a car used for short urban trips, school runs, stop-start traffic or towing may age its oil much faster. Manufacturer approvals for lubricants matter because modern engines are designed as complete systems, with oil being a key ingredient in the whole package. The oil must protect bearings, timing chains, pistons, turbochargers and emissions equipment, while also resisting oxidation, deposit formation, viscosity change and additive depletion over the full drain interval. The right oil is critical Having worked with vehicle manufacturers and motorsport teams for decades, Castrol has accumulated significant amounts of data. Using this insight, Castrol EDGE, the company’s most advanced engine oil, has been engineered to surpass the latest industry and OEM specifications and deliver high performance across seven critical factors: power, endurance, pressure, wear, high-temperature performance, cleanliness, and fuel economy. The Castrol MAGNATEC range has been developed to meet the specific demands of modern driving. A significant 75% of engine wear occurs at the start of a journey and continues during acceleration, deceleration, and idling in city driving. Castrol MAGNATEC clings to critical engine parts and helps to safeguard an engine’s vital components, including the valvetrain, timing chain, pistons and bearings, from damage and wear. tinyurl.com/5dweupa4
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