The Rod Bearing of the BMW M440i xDrive ensures silky smooth engine rotation as the oil fed cushion prevents friction and heat. The small but essential component Rod Bearing separates connecting rods from the crankshaft with a microthin film of oil, allowing the straight six to rev freely while dealing with heavy loads of combustion and earns praise from the BMW community for its rock-solid reliability. The earlier models of M440i xDrive had a Rod Bearing that was bi-metal made of an aluminum-silicone alloy. The later models have started using a tri-metal Rod Bearing that adds copper as well as a lead-tin overlay to the bearing, which enhances strength, fatigue life, and debris embedability. The upgrade boosts efficiency due to reduced drag so that the oil pump can work less because temperatures stay cooler, which supports the M440i xDrive target of sharper throttle response with reduced losses. Clearance of two-thousandths of an inch between the bearings and a precise crush fit locks each Rod Bearing in place and keeps them constantly lubricated while preventing knock. Oil grooves that are machine cut into every Rod Bearing half are aligned with block passages in a way that pressurized lubricant will never starve journals in hard cornering, thereby giving this car predictable handling in the rain and snow. Since the Rod Bearing meets BMW specifications, it can be installed on early M440i xDrive engines and facelifted M440i xDrive engines without further machining, resulting in factory balance and factory warranty. This attention to detail is consistent with the BMW philosophy of dynamic driving pleasure providing everyday usability. Whether on town commutes or mountain switchbacks, there's assurance in the factory BMW lubrication map written around the steady clearance that the stout Rod Bearing delivers. By choosing a genuine insert, one also protects market value, as the service records show the M440i xDrive engine kept its core rotating parts in optimal shape, which helps every BMW enthusiast smile mile after mile.
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