Do I have to buy this echo oil to mix with gasoline? Hardware keeps saying if I buy any other brand I void my warranty. Its extremely pricey and there's my trimmer :
ECHO SRM-410U Brushcutter | Safford Equipment Company
ECHO Power Blend 16 oz. 2-Stroke Cycle Engine Oil 6450006 - The Home Depot
ECHO 25.4 cc Gas 2-Stroke X Series Straight Shaft String Trimmer SRM-2620AA - The Home Depot