I've been using Castrol GTX 20-50 in my 92 300E for the past eight years. I always used it in the diesels that I previously owned. My local independent MB shop uses it for a major number of the MB that they service. I live in eastern NC and the temps aren't severe in the winter and it does get HOT/WARM in the summer.
My 92 has 110k actual miles and I've been the second owner for the last eight years. She does not use oil and I'm skeptic about going to a lighter weight or changing brands for that reason.

Tarheel75

92 300E "Black Pearl"

Was this supposed to be a question? or just info?

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.

You got me on this one. I should have phrased this as a question. Should I be using a lighter oil for these climate conditions?

Tarheel75

IMO opinion, 15 or 20/50 is appropriate for the hottest, most arid summer regions.

In NA and Euro its hard to beat 0W or 5W/40.

Go to Mobil's site and look at a temp service chart.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

I would stick with your 2050.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.