Hot Gas vs. Electric Defrost

[PHENERGY]

Hello,
PHEnergy here, I'm new! and I only got into the Refrigeration Industry five years ago because it consumes so much Electrical Energy, and my Company reduces Electrical and Natural gas Bills for high Energy consumers.
Since Electric Heaters Consume less Electrical energy than the Condensing Unit, Which MUST run to provide the Hot gas I tend to go for electric. It is also easier to control.

But I would like to start a new thread here, one off my sub contractor's tech, just added Capella Oil (Texaco 68) to a newly commisioned blast freezer system using R404A, I Believe there are serious problems to follow. He says he will convert to the more expensive oil POE after a week, is R404A compatible to Capella? if not, how do we go about correcting the error, will we lose all the newwly installed R404A gas? the system demanded 9 x 24Lbs Cylinders of refrigerant. I am now seeing a dark brown cloud in the upper third of the sight glass. the system was started only Yesterday.