Originally Posted by rileyc
The formulation of Castrol GTX Diesel 15W40 appears to meet all the CK4 requirements. The only source for this HDEO near me is Walmart, and the price is $12.37/gal which is inline with other major oil blenders. However, most of the major blenders offer rebates throughout the year making their net price much lower than Castrol GTX Diesel. In my opinion, Castrol needs to offer rebates on GTX Diesel as an incentive for customers to try this HDEO. Based upon the formulation of Castrol GTX Diesel and current retail pricing, there are no compelling reasons to try this oil.
Well it more than "appears" that way, it does show up on the API EOLCS Directory.