Just in case anyone wants to know or does not know, Briggs & Stratton oil, ACE Hardware oil, and Arnold oil are all made by the following company. Here is the first part of their MSDS sheet. Material Safety Data Sheet 1. CHEMICAL PRODUCT AND COMPANY IDENTIFICATION OLYMPIC OIL, LTD. 5000 W. 41st St. Cicero, IL 60804 Technical Contact: Phone: 708-876-7900 (M-F 6:00 A.M. - 4:30 P.M.) MSDS Number: MSOL703 Product Name: BRIGGS HEAVY DUTY LAWNMOWER OIL SAE 30 Emergency Overview Physical State: Liquid Color: Amber Odor: Mild May cause temporary irritation to the eyes. Prolonged or repeated exposure may cause skin irritation. Spills may create a slipping hazard. Key: 4=Severe, 3=Serious, 2=Moderate, 1=Slight, 0=Minimal 2. COMPOSITION, INFORMATION ON INGREDIENTS Hazardous Component(s) CAS# %WT (Approx) Zinc Alkyldithiophosphate Confidential 1 – 5 Alkylated Phenol Confidential 1 – 5 Diphenylamine 122-39-4 0.1 – 0.9 Olympic Oil is a division of Delta Companies Group in Louisiana and Delta Companies Group is a division of a company named Greif located in Columbus, OH.