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 CC is obsolete.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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