The main difference is that the Mahle OC91D is a kit that includes the OC91 oil filter along with additional seal rings for components like the oil drain plug, transmission, and final drive, while the standard OC91 is just the filter itself. The OC91D is designed as a convenient, all-in-one service kit, primarily for specific BMW models, that bundles the necessary filter and crush washers for a complete oil change service.
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