Modern Tire Dealer

DEC 2018

Magazine for the professional tire industry

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Page 28 of 113

—9— ou Know Your Oil? When You Choose Your Oil Your vehicle deserves a high-quality oil. VISCOSITY GRADE Viscosity is a measure of an oil's fl ow characteristics, or thickness at certain temperatures. The temperature requirements set for oil by the Society of Automotive Engineers (SAE) is 0 degrees F (low) and 210 degrees F (high). On an oil container, the low temperature viscosity (e.g. 5W) indicates how quickly an engine will crank in winter and how well the oil will fl ow to lubricate critical engine parts at low temperatures. The higher temperature viscosity (e.g. 30) provides thickness, or body, for good lubrication at operating or higher temperatures. A P I S E R V I C E C K - 4 SAE 10W-30 PERFORMANCE LEVEL Motor oils designed for cars, vans and light trucks with API's "S" (Service) categories. Motor oils designed for heavy-duty trucks and vehicles with diesel engines fall under API's "C" (Commercial) categories. MULTIPLE PERFORMANCE LEVELS Oils designed for diesel engine service might also meet gasoline service. For these oils the designation is "C" category fi rst, followed by the "S" category. "C" category oils have been formulated primarily for diesel engines. CK-4 DESIGNATION Engine manufacturers are expected to recommend API CK-4 oils for on-highway and non-road diesel engines in use today in heavy-duty equipment. CK-4 oils have improved oxidation resistance, shear stability, and aeration control compared with CJ-4 products. CK-4 oils are backward compatible with CJ-4, CI-4 with CI-4 PLUS, CI-4 and CH-4 oils. Still, you should check with the engine manufacturer before moving up to CK-4. Remember to ask about your oil change interval when using CK-4.

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