Initially, I thought the final viscosity would be the arithmetic average of the W viscosities, but it doesn't work that way. Also this oil works for single viscosity oil (such as 10W), not engine oil such as 10W40 mixed with 15W50. If someone thinks I am terribly wrong, please let me know :)Īpparently.yes oil can be mixed, BUT : only the same brand and type of oil, preferably purchased at the same time to make sure the batches are close in composition too. I'm going to show you how I sorted this out. what if I don't want/can't use the BMW oil ? Can I mix other oils to get the right viscosity ? That exotic 11.5W oil seems to be a marketing technique to lock people into buying BMW fork oil. The bigger the difference in viscosity from the original oil, the more turns/clicks would need the adjuster.I was wondering. 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
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