Sold Out Quick view Sinister Diesel Sinister Diesel 03-07 Ford 6.0L Billet Blue Cap Kit - SD-BCK-6.0 Compare $357.49 $274.99 Add some durability and style to your truck using these Sinister Diesel 03-07 Powerstroke billet cap! Unlike the OEM oil and filter caps, these won't crack from overtightening or just the passing of time. All three caps are blue, adding a nice splash of... Currently Out of stock. On order! Currently Out of stock. On order!