Which is the best engine oil to use in an '82 300d with c300k miles?

I've heard a lot of opinions, but cant really find any info. My owners manual reads to use anything from 10w - 20w50 with all kinds of vescosity in between.

I've heard from other MB owners, who swear by 30w, but I would prefer your recommendations.

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Sincerely,
Tommy Darcy
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'82 300D (Turbo) c300k miles, "Mary."
:wtf:

I have no favorite brand but I always use 15W40 diesel rated oil with soot control

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1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C

Wow, an oil question, this is a first.
Just joking, simply stick with what your owner's manual says for the temps that you are living in. My '83 TD owner's manual says that 15W-40 is the recommended weight (viscosity) for temps down to 23 F. So since you are in Charleston, that would mean 15W-40 would cover your local year round temps., for sure. Here in CT, for the Winter I switch down to 10W-40 then go back to 15W-40. for the Spring/Summer I use the same oil in both the diesels and the SL, which happens to call for the same viscosity.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member

Delvac Super or Delo 400 for regular use and for truly extreme conditions, consider Delvac-I or Delo 400 Synthetic, although I have seen the regular Delvac Super and Delo 400 handle high heat conditions with ease, I would use the synthetics on extremely low temp conditions.