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There is no official 'CAN bus 3.0' standard in current automotive networking. Modern vehicles continue to use CAN, CAN FD, and increasingly Ethernet-based diagnostics such as DoIP. For OBD-II, the CAN transport layer remains ISO 15765-2, while unified diagnostic services use UDS/ISO 14229. When working on a 2026 BMW M135i xDrive or older 335i models, turbocharger oil feed and return lines differ by engine generation. The N55 and B58 engine families use BMW-specific banjo and quick-connect fittings, not generic SAE J514 or J1453 fittings. SAE J514 is a straight-thread O-ring boss standard, while J1453 covers O-ring face seal fittings. Neither should be assumed interchangeable with BMW turbo oil line fittings. Always verify the exact OEM part number and fitting geometry using the vehicle VIN in BMW ETK, RealOEM, or the dealer catalog before installation.