jlg89 wrote:
There's an interesting series of "shootout" videos on YouTube that use simple but consistent and effective tests to rate various synthetic motor oils at various viscosities. Mobil1 consistently scores very high, if not tops, even against top European and Japanese oils, as well as "boutique" oils.
https://www.youtube.com/@NATESINTERACTIVEAUTO/playlistsThe real question in my mind is which specific weight to use. When I run 15W-40, the Libby tends to burn a decent amount of oil. I also drive a MB ML350 with the V6 turbodiesel, and it does the same thing with 15W-40...but it doesn't go through 5W-40 nearly as quickly. My Diesel mechanic confirmed that behavior, and said that the ML really prefers 5W-40. The Liberty might prefer 15W-40, but I want to see what it thinks about 5W-40, and whether it burns less oil with the lighter weight.
A big problem with the oil tests link you shared; there is NO comparison of API "Diesel Rated" oils that I could find, all their tests are on oils for
gasoline engines.
If you are using 15W-40 full synthetic oil in your CRD, be darn sure it is a API
Diesel Rated oil, CH4 or higher; preferably CK4 is best.
Using a Gasoline rated oil in a diesel engine is a recipe for disaster!
Note: I run Shell Rotella T6 Full Synthetic 15W-40 oil year round in my CRD and have never had to add any oil between oil changes performed every 5k miles.
Some of the better oil recommendations for your Diesel engine:
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