I have a swift sundance 630l on a fiat ducato multijet (diesel). I have tried reading the manual to find out the best oil. To use but am at a total loss. Any ideas?
It depends how old your motorhome is. Fiat recommends Selenia Wide Range Pure Energy (WR PE) engine lubricant, and the latest Euro 5 engines require 5W-30, while pre-2011 Euro 4 models require 5W-40.
If you've got one of the newer Euro 5 models, this information should be on pages 267 and 268 of your handbook. Not sure where it is in the handbooks for pre-facelift Ducatos, though.
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