E9 Engine Parts Index
M30 engine components, gaskets, and service items organized by assembly.
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Parts & Diagrams
Part explanations, diagram summaries, interchange notes, and sourcing guidance. Original write-ups from study; no factory catalog reproductions.
Parts Index
Organized reference to major component groups across both platforms.
Exploded Diagrams Explained
Original diagram summaries explaining assembly relationships. Illustrations pending. for future custom illustrations.
Part Number Notes
How to read BMW part numbers, supersession chains, and common numbering conventions for these platforms.
Parts Interchange
Cross-platform and cross-year component compatibility notes.
E9 / E3 / E12 Mechanical Interchange
Shared M30, suspension, and brake components across contemporary BMW models.
DraftE9 Year-to-Year Part Changes
Components that changed between early and late E9 production.
DraftM1 / M88 Component Interchange
M88 engine family interchange with M635CSi and motorsport variants.
DraftHard-to-Find Parts
Obsolete, NLA, and difficult-to-source components with known alternatives.
E9 NLA Body Panels and Sections
Structural sections no longer available from BMW and known reproduction sources.
DraftE9 Trim and Interior NLA Items
Discontinued trim, switches, and interior hardware with sourcing notes.
DraftM1 Specialist Parts Sourcing
Known suppliers, remanufacturers, and specialist fabricators for M1 components.
DraftReplacement vs Original Parts
Guidance on when reproduction, remanufactured, or upgraded parts are appropriate.
E9 Reproduction Body Panel Quality Guide
Evaluating aftermarket panel fit, gauge, and structural correctness.
DraftE9 Mechanical Replacement Parts Guide
Bushings, seals, gaskets, and wear items: OEM vs aftermarket considerations.
DraftM1 Original vs Replacement Decision Guide
When to preserve original components and when replacement is justified.
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