From the Delo PDS:
"Delo 400 LE SAE 15W-40 is a mixed fleet motor oil recommended for naturally aspirated and turbocharged four-stroke diesel engines and four-stroke gasoline
engines in which the API CJ-4 service category and
SAE 15W-40 viscosity grade are recommended."

I don't think there's much question that a dedicated race oil would be better, but my car is mainly there to stop the garage slab from flying away, and I currently have a drum of Delo 400...
Basically just wanted to see what the current thoughts were in the diesel oil (as ideas/theories often change as time progresses).

Cheers!