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Is oil engine 10W-30 for GMC XL 1500 Appropriate in climet temprature 39-43 C.
About Oils. Some are "blends" some are straight-vs-detergent. Most people or experts cannot tell use what 5w30, or 10w40 means. Most every small engine manufacturer, car maker, even imported chinese engine makers have a "maintenance schedule" which lists types of oils to be used & in what tempatures. 5w30= 5 thousandths of clearance of oil protection when hot between surfaces, 30 thousandths, when cold. 10w40= 10 thousandths oil clearance when hot, between surfaces, 40 thousandths cold. ON LAWNMOWER, or "air cooled" engines, they are cooled by air. They are hot, (no radiator system). I prefer SAE30, a straight oil, to always give protection
10w30 is usually pretty safe but if your going to be in those temperatures continually, I'd at least go to 10w40. Not knowing the year or engine, I'd say check your owners manual & it should show you a chart for approved oil in different temperatures.
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