Mobil, who are now EXXON were one who recommended it.
As a past Professional Engineer with EXXON ( my first employer after university), I am fully aware of the basis for many of their recommendations. I have a number of contacts there.
If you read my post properly you will see the recommendations of Mobil (now EXXON) and Shell covered both road cars ( including 300D's) as well as other equipment.
Would you please provide some details of your professional background so that your comments can have an appropriate degree of merit. Do you have any lubrication specialty? Are you just quoting from the standard publications?

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving