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The bigger the difference in viscosity from the original oil, the more turns/clicks would need the adjuster.Introduction / Specification of Shock Absorber Oil:ĮASTTO SHOCK ABSORBER OIL 12, 18 are blended from high viscosity index oils and specially selected additives to provide excellent anti-wear, anti-rust and anti-oxidation properties. This doesn’t means that suspension behaves exactly the same as with 14,14cst oil, but slow speed behaviour is similar. Turn the external adjusters 1 click/1/8turn anti-clockwise. This means that all damping (compression and rebound) will be slower, in general. Couldn’t find nothing else than a 15.3cst oil. Beyond that, the damping behaviour is quite different.Ī change on oil’s viscosity could need a new damping adjuster (low speed adjusters COMP/TEN) set-up. If you can’t find the same viscosity as your original oil has, choose one with a difference of +/- 5cst. SAE range is only shown for your reference. Suspension oil equivalence chartīelow you can find a equivalence suspension oil chart (both for motorcycle and bicycle) where you can easily choose the closest oil to the original one. Therefore, it is important to remember that the viscosity of a fluid (resistance offered by a liquid to flow) has nothing to do with its density (mass per unit volume). The greater the number, the more stable the viscosity is against temperature changes. Viscosity index indicates the “quality” of the oil. The viscosity is measured in centistokes (cSt) or mm2/s at 40✬ as a reference temperature and is a technical characteristic of each oil. You can also look up for it on internet forums, although it may take longer. You can look up for the original oil specs in the workshop manual or by asking to an official dealer. In case you can’t find the original oil, use the one with the closest kinematic viscosity. We recommend using the original oil on your suspensions so that the damping behavior is not changed. Want to learn more? Get our Motorcycle Geometry and Suspension Adjustment e-book! General recommendations