If you are really concerned and the Barrels are marked with a makers name or other information you might be able look up exactly what type of Calibration Oil it is.

They use Calibration Oil in Fuel Injection Pump Test Stands to test IPs. When you are done the Tech drains as much as he can out because it is expensive not becaue it will do harm.

I doubt if any harm would come if what ever is in ther is mixed with 30 gal of Bio before it goes into the Engine.

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84 300D, 82 Volvo 244Gl Diesel