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In my personal opinion No reason not to use Premium blue 5-40 In my professional opinion, If it does not meet the spec specified in the owners manual and your under warranty, don't use it. I dont off the top of my head know the spec but there are only 2 oils that have it, the last time I looked, they were both Mobil 1, 0-40 "European" and 5/0-40 esp
In my personal opinion any synthetic 5-40 with a CJ4 or CI4 rating is just fine. (7500-10000 miles) I would no use a non synthetic in my crd for multiple reasons but if used with reasonable intervals I think a 15-40, if environmentally acceptable (aka not cold) should be fine 3000-5000 miles.
Check out the used oil analysis thread. The crd is not particularly mean to oil. I personally use rotella t6 and run it to 9000 miles.
_________________ 06 CRD Limited. IMII, GDE TCM, Carter transfer pump, Upgraded oem primary, 2 micron secondary, 3 inch mandrel straight pipe. Transgo shift kit, EHM, fcv butterfly removed, egr plated off. 19 3/8 solid flex fan, no electric fan, 10k lb aux trans cooler. Frankenlift II, Mopar skids, allj's rails, 235/85 km2 on stock rims
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