I sent an email to Castrol last week:
"What is the status of Castrol EDGE 0W-30 and 0W-40? I notice that both are no longer listed on Castrol USA's website. Are they being discontinued? I use both in my daily drivers."
Received a response this morning:
"Thank you for contacting Castrol North America.
Castrol EDGE 0W-30 and Castrol EDGE 0W-40 A3/B4 oils are currently available products.
The above Castrol EDGE oils are sold by retailers such as Wal-Mart, AutoZone, Advance Auto Parts, O’Reilly Auto Parts, Pep Boys, Strauss, NAPA Auto Parts and by select quick lubes, dealerships and auto service centers around the country.
The above mentioned national retailers who carry Castrol products order their products from a warehouse, who in turn, order the product from us. Generally it is based on consumer demand therefore we are unable to advise you of a specific retail location that carries that particular product -- please call the surrounding stores directly to inquire about product availability.
Castrol always recommends following the guidelines of the engine manufacturer for the recommended oil (i.e. SAE grade, API rating and manufacturer specifications) specific to your application. This information can always be found in the owner’s manual or by contacting the manufacturer directly.
Thank you again for contacting Castrol, we value your patronage!
Castrol Consumer Relations"
Perhaps it is not being discontinued (or maybe just in Canada, Garak?)