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OG Images.
https://oil-glup.ru/threads/pochemu-ilsac.241/page-5#post-31430
A vintage newspaper clipping from The Vindicator dated Thursday, May 2, 1985, presents a guide to understanding motor oil facts and markings on a quart can. The central diagram highlights an API service donut labeled SF/CC with SAE 5W-30 viscosity in the middle, surrounded by explanatory callouts detailing service ratings, diesel approvals, and energy-conserving properties. These pointers break down how multi-viscosity ratings handle temperature changes and reduce engine friction to save fuel, helping drivers pick the right grade for the weather.