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#1
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Castrol 5W-50 (API SL/CF) for 300SD?
Dear friends:
I've rummaged through my garage and found about 8 quarts of Castrol Syntec 5W-50 (API SL/CF) I bought a long time ago. Since most dino oils for diesel are 15W-40, I wonder whether 5W-50 is too thin for diesel (a 300SD)? I believe that Mobil Delvac 1 is 5W-40, so it seems that Castrol Syntec 5W-50 should be OK too. I wished I bought Castrol Syntec 20W-50 before. What do you think? Anyone has used this oil/weight in their MB diesel? Thanks. Eric P.S. I knew that Castrol Syntec is not true synthetic oil, but I bought it because Castrol USA was having some very good promotion at that time |
#2
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That should be fine, but anything lower than 5W shouldn't be used. The first oil change in the 83 I used some Castrol Syntec Truck 15w40, figured it should clean stuff out before going to a full synthetic.
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Jeff M. Mercedes W123 DIY pages are now located here. 1983 / 1984 300D Sold 2000 CLK430 Cabriolet ~58k Sold 2005 Avalanche 4x4 ~66k |
#3
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I think it's OK... just don't leave it in there very long. I'd change it by 5000 miles and go back to a quality synthetic like M-1 or Amsoil. Also, it is approved by MB as well:
http://www.whnet.com/4x4/oil.html |
#4
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Speaking of Catrol, has anyone used Castrol Elixor which is used quite extensively on the truck racing circuit in Germany. Seems to be a high performance diesel oil.
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#5
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From what I have seen all synthetic oil weights have a "C" rating. It just when it comes to dino oil, only 15W-40 is rated for diesels.
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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 |
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