![]() I just bought this bike from a dealership a few hundred km's away. I'm wondering if I'd be better off just finding another brand of synthetic hypoid gear oil with the GL-5 rating and 70W-80 weight specified in my manual? It seems odd to run a 75W-90 when the manual calls for 70W-80. I read on another forum that this is likely the same as Castrol SAF-XO. This makes it roughly 25% of what it would cost me to run the specified Hypoid Axle G3. I can get a liter of it for about $50 CAD. I found it online but it's going to cost me roughly $85 USD with shipping to Canada for only a 500mL bottle, and that's before customs/duites! Was this product discontinued and all that's left is marked up old stock? ![]() Multigrade oil viscosities are not representative at other temperatures.I'm looking for the oil recommended in the owners manual for the final drive in my 2019 R1250RT. My dealer told me they don't carry it and it might be discontinued as there are no quantities available to order from Germany. SAE Gear and Crankcase specifications are at 100° C only. Note: Viscosities at various temperatures are related horizontally. Rule of Thumb: The comparable ISO grade of a given product whose viscosity in SUS at 100 deg F is known can be determined by using the following conversion formula: For example, a lubricant with an ISO grade of 32 has a viscosity within the range of 28.8 - 35.2 cSt, the midpoint of which is 32 cSt. Each ISO viscosity grade number corresponds to the mid-point of a viscosity range expressed in centistokes (cSt) at 40 deg C. Many petroleum products are graded according to the ISO Viscosity Classification System, approved by the international standards organization (ISO). Hydraulic, Industrial Gear, Compressor and Rockdrill Oils Less dry running means much less engine wear. ![]() The quicker the oil flows cold, the less dry running. The advantages of a low W viscosity number is obvious. This allows the engine to get quick oil flow when it is started cold verses dry running until lubricant either warms up sufficiently or is finally forced through the engine oil system. For example, a 5W-30 motor oil performs like a SAE 5 motor oil at the cold temperature specified, but still has the SAE 30 viscosity at 100° C, which is engine operating temperature. The difference is when the viscosity is tested at a much colder temperature. In other words, an SAE 30 motor oil is the same viscosity as a 10w-30 or 5W-30 at 100° C. The numbers without the W are all tested at 100° C which is considered an approximation of engine operating temperature. Viscosity UnderstandingĮngine, Automotive Transmission and Gear Oils - An 5W-30 (multigrade) vs an SAE 30 (monograde)Ī W on a viscosity rating means that this oil viscosity has been tested at a Colder temperature. These are translated into the easier to understand SAE viscosity numbers you see on an oil bottle. You will see oil viscosity measurement in lube articles stated in kinematic (kv) and absolute (cSt) terms. The thicker (higher viscosity) an oil, the slower it will flow. Viscosity is the oil's resistance to flow or, an oil's speed of flow as measured through a device known as a viscometer.
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