Originally Posted By: bonjo
DOes HDEO stand for heavy duty engine oil? and is it produced and meant to be used in Diesel engines
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Yes and no, Yes it stands for heavy duty engine oil and no it's not just meant to be used in Diesel engines. It's API certified for Diesel engine use AND you will also notice it carries an API for gasoline engines, normally SM in the Untied States but some may be rated SG,SH or SL though more rare and also depending on country.