Unlike traditional oil, synthetic oil contains no impurities and has special additives included that help protect and improve your diesel engine’s performance and longevity. If you look on your truck’s engine oil cap, you will usually see the manufacturer’s recommended oil specifications for your diesel engine. This will also be in your owner’s manual.
Generally, a Chevy Colorado with the Duramax diesel engine runs on a full synthetic 5W30 or 5W40. Most Colorado diesel truck drivers recommend finding brands that are GM dexos2- approved. This includes: