Posted by FBH44 on April 20, 2014 at 07:20:19 from (64.85.214.177):
I've been trying to understand rating systems for oils. I'm beginning to believe after all the unending blah-blah-blah, it is pretty straightforward; Viscosity - Get the correct viscosity; if the engine calls for 10W-30, get it. The 10W means it meets the API winter "W" designation for 10-viscosity. The -30 means it meets the API summer designation for 30-viscosity. If different oils all say 10W-30, their viscosities equal each other, according to their manufacturers. Service - "C" service means it is rated for Compression-ignition engines [diesels]. There are three current designations, CJ-4, CI-4, and CH-4. CC is obsolete. "S" service oils are rated for Spark-ignition engines. Current designations are SN [the latest one], SM, SL and SJ. {Previous S-designations are obsolete. They may work, but just for one example previous S designations may have enough phosphorus to harm your catalytic converter.] CJ-4 CAN be rated for SL or SM service by the maker. CI-4 CAN be rated SL. CH-4 CAN be rated SJ. What I'm coming to believe, if my gas pick-up calls for 10W-30, and if I run a 10W-30 Service SN oil, the rest of it is just anecdotes and advertising.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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