mci7 is right in that it is your choice but to think that lubricating oils are the same chemical make up that was available as little as 10 years ago is mis-information. Even the dino oils are enhanced with detergents and friction additives. The base stock is different due to refining methods and the government requirements. If the only advantage is a cold start on a diesel without preheat you are chasing the wrong goal, 5000 mile oil changes are a personal choice. Trucking companies average 12-15000 mile oil changes working the engines hard all day everyday. The video was part of a Mobil 1 advertisement but what he was showing you is a fact, all you have to do is ask a diesel mechanic about coking oil on turbo bearings. Series 4 synthetics are chemically engineered oil molecules which makes a cleaner and more stable oil molecule which flows at lower temperatures and burns off at higher temperatures. Zero advantages I will disagree, personal choice definitely. Cummins compatible they agree within break in specs. I know that getting my diesel started is minor after living in the cold north for 50+ years, seeing oil pressure within 4-5 seconds at -20 or lower is saving my bottom end and valve train. Worrying about it in a motorhome not as critical because they usually are not used in those temps. However there have been several posts on here about costly engine failures and some were heat related which synthetic oils are better at handling. Take your oil sample to a lab for testing and see if they agree all oil is the same and what's in yours. I also like LED technology too makes me feel good.
