Date: Thu, 04 Feb 1999 00:23:37 GMT From: bulwnklnopsambee_emm.net (Eoin) Subject: Re: Oil features
All good, Johan, but the A does not mean "lite work" and the F heavy. These letters are a bunch of specifications the oils must pass that have been updated (and gotten stricter) over time. Also, just FYI, the S means spark ignition and the C means compression ignition. Meaning essentially gasoline and diesel, just like you said. On Wed, 3 Feb 1999 22:17:54 +0100, "Johan LAUWERS" <lauwers.sablonnopsam.be> wrote: >Here are the scientific explations I learned at the university : > >Measurements are done at 255.2 K (0 °F) for thin oils and 371.9 K (210 °F) >for the others. Nowadays the classes of oil are given by some more complex >systems (modern oils : multigrade oils) > >e.g. 15W40 is the S.A.E-class (Society of Automotive Engineers) > >15W gives the class for lower temperature e.g. the minimum dynamic viscosity >(resistence too flow) at the lowest Temperature (cf. above) is 2606 cst >(centistokes) and the maximum is 5200 cst. >40 gives the class of higher temperature in this case the minimum d.v. is >13.93 cst and the max is 16.77 cst. > >Often there are letters behind the code e.g. concerning the use : 15W40/ >SA....SF this for gasoline cars the A means very lite work, the F means >heavy traffic and a lot of cold starts. The S is replaced bij a C for >Diesel cars the upper limit of the second letter by Diesel cars is a D >(CA....CD). > >Johan >83 900 GLi >94 9000 CS >94 9000 CSE > >
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