What Oil is High in Sulfur? Understanding Sour Crude and Other Sulfur-Rich Oils
                                
                                
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                                    4 min read                                
                            
                                Sour crude oil, by definition containing more than 0.5% sulfur by weight, is the primary type of oil identified as high in sulfur. This differs significantly from 'sweet' crude and presents unique challenges and costs for the refining industry due to its corrosive and polluting nature.