http://www.rotax-owner.com/en/rotax-blog/item/39-new-aeroshell-sport-plus-four
http://www.aircraftspruce.com/catalog/eppages/aeroshelloilsportplus4.php
http://www.shell.com/global/products-services/solutions-for-businesses/aviation/aeroshell/products/piston-engine-oils/sports-plus4.html