It is cleared up a bit in this link. Thought it would be helpful.
http://www.castrol.com/liveassets/bp_int...ol_EDGE_FAQ.pdf
For reading it, "SPT" is Syntec Powertrain Protection" or something. its one step below Edge, Castrol's "Best motor oil."
Edge us more likely to take on M1, i think Edge with Syntec fills a good niivhe. All grades retained, too! Shocker.
http://www.castrol.com/liveassets/bp_int...ol_EDGE_FAQ.pdf
For reading it, "SPT" is Syntec Powertrain Protection" or something. its one step below Edge, Castrol's "Best motor oil."
Edge us more likely to take on M1, i think Edge with Syntec fills a good niivhe. All grades retained, too! Shocker.