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Old 06-01-2000, 12:03 AM
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Aaron Aaron is offline
Join Date: Aug 1999
Location: Cincinnati, Ohio
Posts: 1,935


I always use Castrol GTX 10W-40 in my 300SD and used it in my 240D. Castrol does make a special diesel formulation for diesels called RX Super, but it only is in the 15W-40 grade. I found it harder to start my diesel in cold weather with this oil in it and it seemed to run slightly warmer at high speeds. I'd stick with regular GTX 10W-40. It's recommended for all passenger car engines, gas and diesel, turbo and non-turbo. Synthetic is certainly good, but a diesel with alot of miles should be kept on the same maintenance regimen.

Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'80 300SD
'85 380SE
'89 420SEL
'93 300E 2.8
'74 Jensen Interceptor Mk.III
'81 DeLorean DMC12
'85 BMW 745i Turbo
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