Note the numbers above, 4.9 and 13.2, at the temperatures cited compare those figures with YOUR manufacturer's figures and do note where it says MINimum. For the most part, you can translate that to modern 5 to 7-1/2 fork oils. ![]() Except for some GS models, all the old BMW's needed a very thin oil, ~ SAE 4. Because of that, stick with ONE manufacturer if you are trying different viscosity grades. not so for these fork and suspension oils. Viscosity CAN be reasonably depended on, at least when the oil is brand-new, for engine & gear oils BUT. For the various fork oils & suspension fluids, the various manufacturer's do not agree on measuring viscosity. To save you the trouble, the viscosity specifications for that oil are:ĭue to how it is specified, & the lack of superior stiction fighters, & some other characteristics, IMO you are better off with a REAL fork-specific oil. The number has a letter at the end, and it is presently E. You could find its full specifications using a search engine for: MIL-H-5606. In the early Airhead days, BMW fork oil, at least for USA-sold and serviced motorcycles, was colored red & was a military hydraulic oil. They are GOOD, have low stiction, wide temperature range (decent VI too), and the viscosities can be depended upon. I prefer Spectro's fork oils, or suspension fluids. It is the SAME oil inside the container, no matter what prefix is in the part number.Ī question mark (?), if any, means I am unsure of that value. I list these prefixes,īelow, so that if you see them on your container, you will not be confused. Other container sizes will have different prefixes, such as the small container that has an O as prefix for the SX400 oil, below, which signifies a PINT (why not a P?, no, I don't know) container. in front of the several characters following means LITER size containers this L will be found on the containers in the product number. Spectro is not the only company that has mixed-up oil specifications, so has Castrol, just to mention a major brand amongst many others.įor Spectro products, the L. The information I present to you below is the CORRECT information, AFAIK, no matter what you may find in any literature from Spectro Oils. I notified Spectro of these errors, and they probably have corrected the errors. THEY were confusing SUS & Cst, & a few other things. I found ERRORS in Spectro Oils own charts/graphs on their website. Some years ago, most of the oil packaging industry changed from using SUS (Saybolt Universal Seconds) to Centistokes when describing viscosity. If you are interested in how oil REALLY lubricates, refer to: (this link also has extensive brands and versions of oils and characteristics, in a charted format) Note the link near the end of the article, duplicated here due to importance: If you are trying to modify shocks or suspension by changing the oils or, if you are curious about motor and gear oils, etc., this article may be of extra help. Some information in a link for bikes and cars/trucks. ZDDP?įor: BMW and other motorcycles (and even some bicycles!). ![]() Motor oils, gear oils, transmission oils, rear drive oils.īMW factory recommendations chart. Suspension fluids, fork & shock absorber fluids. ![]() Snowbum's BMW Motorcycle Repair & Information WebsiteĬlicking on them at every visit helps support this website.Ĭlicking on something inside the advertisement helps even more!
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