Ford might very well call this an alcohol and void warranty coverage if a failure occurs in the fuel system. I don't know what is in the manuals of other brand diesels. Look up the MSDS for 911 and you will find Aliphatic Hydroxy Hydrocarbons.
From the Ford owners manual:
Diesel fuel conditioner
Additives that will improve fuel cetane numbers may be used to
verify/enhance fuel quality. Use Motorcraft
or an equivalent cetane
booster & performance improver as listed in the
Maintenance product
specifications and capacities
section in this chapter. The customer
warranty may be void from using additives that do not meet or exceed
Ford specifications.
Do not use alcohol based additives to correct fuel gelling. This may
result in damage to the fuel injectors/system. Use Motorcraft
or an equivalent anti-gel & performance improver as listed in the
Maintenance
product specifications and capacities
section in this chapter. The
customer warranty may be void from using additives that do not meet or
exceed Ford specifications.