D007 tail profile is a bit narrower than a D176/A176. Make sure this doesn't uncover the oiler slot or run the chain rivets against the bar pad or clutch cover. Most time's they're fine. You can use a D096/D196/UXL bar (later Homelite XL series and Poulans that have 3/8" studs rather than 5/16") with stud spacers.
The Windsor/Sandvik bar that's on your Echo now should be a UXL with stud spacers, as that's how the Windsor UXL pattern bars were used on 5/16" stud Poulans (4200/4400/4900/5400 and 245/306) as OEM. Windsor never made a bar that matches the D176, instead just including 'S' or ring type spacers.
See if the check valve for the tank is still working . If it’s stuck open , the tank will gravity feed .My Echo CS-310 leaks a whole tank of bar oil when its sitting and not even being run. Loosening and tightening the oil tank cap doesn't do a bit of good. How can one fix it?