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Houston HB:
My service MGR - told me the 10W-30 viscosity use was strictly to help increase MPG - though this viscosity has shown & proven to serve & protect very well - via Many Stellar UOA.
Just a Fun Fact ------> No where on any Data Posted or Labels - Does the 10W-30 viscosity advertise or claim ---------> Lower Engine Wear - when compared to the 5W-40 or 15W-40 viscosities.
Your Manual will some what guide you in what THEY think is proper Viscosity for your region (Temp Climate) - The 5W-40 viscosity is the go to viscosity for almost every condition - These Days!
Running a True Actual 100% Full Synthetic 15W-40 in my opinion is Ideal - (Most will disagree - but that's perfectly fine) My feelings are not fragile & will never be hurt due to a oil & filter conversation.
1. Amsoil 15W-40
2. TRIAX Supreme ESP 15W-40
3. Royal Purple Duralec 15W-40
4. Red Line 15W-40
5. Rotella T6 15W-40 -- unless ya live or work in a -10*F or colder climate 24/7 - Then a HDEO 0W-40 would be a smart choice.
Now since all that Mombo Jumbo is spewed out all over the table - Look into or at any HDEO 5W-40.
1. Rotella T6 5W-40
2. M1 TDT 5W-40 or Delvac 1 5W-40
3. Valvoline Premium Blue Extreme 5W-40
4. Delo 400 XSP 5W-40 - Just a few that can be bought off the shelf. --> Cummins Certified Oils!
More (Expensive) Boutique Oils: Amsoil 5W-40
1. Hot Shots Secret (Green or Blue) Diamond 5W-40
2. Schaeffers 9000 5W-40
3. Royal Purple 5W-40
4. Motul 8100 5W-40
5. TRIAX Supreme ESP 5W-40
6. Red Line 5W-40
If you actually live and breath in Houston , TX year round? ---> You can easily get by with running a 15W-40 (Conventional or Synthetic) yr round with zero issues!
Just my thoughts on Oil Filters: Try to stay with either of these ------->Mopar / Fleetguard / Amsoil / Donaldson Blue ----> All of these are built of the highest quality -- I personally would throw the Wix XP in there as well but I won't
Look into these items - which will help keep your oil change easy and almost mess free. (I bought 2 of these - One for the Old filter removal through the fender well & One for the New filter going in).
https://www.genosgarage.com/product/...ofc-tool/tools
If you stay with the Mopar Oil Filters (Fluted Bottom) - You will love this filter wrench.
https://www.ebay.com/itm/Turbo-Diese...75.c100623.m-1
Last but not least --> My saving grace when it comes to oil changes.
https://www.genosgarage.com/product/...a/drain-valves
or
https://www.fumotooildrainvalve.com/...modelId=647295
Since I go through the fender well with my filter - I fill the new filter up a bit more then 1/2 way and then screw in the plug - I did use a dremel and cut away a bit more up top of the plastic inner liner of the fender well just enough where I could see myself actually screwing on the new filter.
Genos Garage is a Very Good Source to purchase items like these.
https://www.genosgarage.com/
Good Luck in your Quest!
Any more questions - don't hesitate to ask.
Note: Take all this spewage with a grain of salt - Most of these oils are Over Excessive - for those owners whom only plan on keeping their 6.7L for 3-5 yrs - If ya plan on keeping yours for 8-15 yrs - most of these oils & filters will serve and protect your investment well.
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