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Capacities & Fluids · Fluid rules

Fork oil viscosity ceiling

Value
SAE 10 max
Applies · non-GS
Never raise viscosity to mask stiction — fix assembly alignment instead. BMW-WSM7 §31 The 12.77 sheet names the factory fills: shock-absorber oil — Shell 4001, Shell Aero Fluid 4, BP Aero Hydraulic 1, Castrol DB Hydraulic Fluid, Castrol Shock Absorber 1–318 — all thin hydraulic stock, consistent with the ≈ SAE 4 figure.

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