I have a new to me OM642 powered R320. This is by far the newest diesel I've messed with. I'm wondering how the 642 compares to the older engines(om617 etc) is regards to fuel/oil treatments etc.

I regularly put a bit of 2-cycle oil in with the D2 diesel used in my 617 powered cars. Is that still a good idea with the 642?
Or is it just fine since it was designed to run the ULSD?
Can I use diesel purge?
Is B5 the only mix of bio fuel I can use?
Use diesel kleen?
Can I use "Warren Distribution Howes Lubricator Fuel Additive Diesel Treatment"?
Occasional ATF in the fuel to clean injectors?

From the above list I only regularly used 2-cycle oil and the amber colored stuff known as "Warren Distribution Howes Lubricator Fuel Additive Diesel Treatment", I guess I never really knew the name of it.

I',m sure the biodiesel question has been answered before, please forgive me.

Thanks

PS: Do you think there is ever going to be a need to plug this thing in(block heater) when it's really cold? Never plugged 603's in, ever. But I did sometimes with the 617's.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D