Oil choices - Dodge Cummins Diesel Forum
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post #1 of 31 (permalink) Old 02-12-2020, 03:49 PM Thread Starter
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Oil choices

At 209K miles and not knowing what oil has previously been used, what does everyone recommend to use? I work at NAPA so I have all the options available . I was thinking about using Royal Purple since I run it in my HEMI, but I don't want to risk causing any problems with this truck.

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post #2 of 31 (permalink) Old 02-12-2020, 04:04 PM
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Any 15-40 or 5-40. Change it regularly. Happy truck.
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post #3 of 31 (permalink) Old 02-12-2020, 06:58 PM
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Cummins 5.9s are extremely easy on motor oils used. Stick with a 15w40 conventional brand name on sale.
Put the money saved into keeping the steering front suspension in top order with the highest quality parts made by specialty manufs for the pickup market.

Costco, Walmart, Sams and the auto parts stores for oil sales.
Be sure everytime after tow or hard hot run to cool the turbo down, they're oil cooled. Cools the oil down also, must have EGT gauge and oil temp gauge.

Don't go cheap on the oil filters, Donaldson, Fleetguard Baldwin.

Do NOT use the OEM POS small fuel filter. Aftermarket HD commercial unit added on, water separator and separate 3 micron dirt filter. Couple Baldwin bases, hose, fittings and CAT Donaldson Fleetguard spin on dirt filter and Baldwin water separator spin on can with bottom water drain. Dirt and water kills the expensive injectors in these, makes your wallet bleed blood
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post #4 of 31 (permalink) Old 02-12-2020, 07:26 PM
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I run Valvoline Premium Blue 15-40, same oil the dealer uses. Endorsed by Cummins. Buy it on sale at Walmart. Fleetgaurd oil filters ordered on Amazon.
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post #5 of 31 (permalink) Old 02-12-2020, 08:18 PM
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I run royal purple 15W-40... not sure exactly when I switched, probably close to 300k using it.
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post #6 of 31 (permalink) Old 02-13-2020, 06:14 AM
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My 06 has 200,005 miles,used to pull my camper. I have always used 15 40 vavoline premium blue. Which I buy at my local napa.
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post #7 of 31 (permalink) Old 02-13-2020, 08:34 AM
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Welcome !
Choice of oil may depend on your intended oil change interval .

If you plan on 5k , then any good diesel rated non syth oil will be great .
If you plan on extended oil changes 10-15k with oil samples sent in ,, then i would use a fancy expensive oil.

Personally i would never use high priced oils ( keep in mind its ALLOT of oil ) with a 5k oil change interval when any diesel rated oil would do the job really well.

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post #8 of 31 (permalink) Old 02-13-2020, 08:41 AM
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I luv me some Napa , and the work they do with the Wounded Warriors and such .

However ...

IF you have any pull , please fire / change suppliers of re man steering boxes. They are horrible horrid and other terms that might give me a Time Out here .
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post #9 of 31 (permalink) Old 02-13-2020, 10:46 AM
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Quote:
Originally Posted by jaylee0712 View Post
At 209K miles and not knowing what oil has previously been used, what does everyone recommend to use? I work at NAPA so I have all the options available . I was thinking about using Royal Purple since I run it in my HEMI, but I don't want to risk causing any problems with this truck.
Oil is a commodity. As long as it meets the diesel spec any of them will work. Only two reasons to go with more expensive synthetic.
1. Longer change intervals
2. Less sludge

There are all of the threads beating the topic to death. But the only practical difference between synthetic and conventional is the uniformity of the base stock. a 15W-40 conventional is a 15w base stock with a non-uniform viscosity of the mixture. But when you measure viscosity it comes out at 15w. Because of this the lighter elements thin out more when it gets hot and you have more additives per volume than you have on a synthetic uniform base stock oil. Because you have more additives the oil doesn't last as long because of the shearing forces in the engine that break up those long chain viscosity improvers breaks up the bigger additive package faster.

Don't go with a synthetic blend. (They only have to be 5% synthetic to slap that label on there and they charge you 75% of the price)

24hrsparkey is right on with not bothering with shorter change intervals. I'm using 15W-40 T6 synthetic. Last sampled at 13,378 miles and got a recommendation to sample again at 18k as all the metrics are looking good. I'm at 15,300 now. Figure this sample and I'll change it out. Costs about $75 for an oil change and $25 to sample. So, if I skip a change by sampling I can take 3 samples and have the cost be a wash while getting good data for engine wear and health. Right now it looks like the oil's limiting factor is going to be the TBN.
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post #10 of 31 (permalink) Old 02-13-2020, 11:12 AM
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Quote:
synthetic motor oil provides outstanding high-temperature performance and is proven to protect at engine temperatures up to 500 degrees Fahrenheit
another advantage of synth is that if you do happen to have an overheating incident, you have at least a chance to survive without major damage (up to a point of course)

regular oil at 350 degrees Fahrenheit is basically non-functional, and you will have major damage

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post #11 of 31 (permalink) Old 02-13-2020, 05:59 PM
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Ive run a little of everything. Dont over think it. In the 100,000 miles I have had the truck, I have run:

Rotella 15W-40
Mobil Turbo Diesel 5W-40 Synthetic
Rotella T6 5W-40 Synthetic
Mobil Delvac 15W-40
A mix of Rotella T6, Mobil Turbo Diesel and Delvac 15W-40 (I had enough laying around left over, to do an oil change with these 3)

This last run, I did 50% Delvac 15W-40 and 50% Delvac ESP 5W-40 Synthetic. I have 8,000 on this change, and will run it to 13,000 to 15,000.... and change it and send samples for both VOA and UOA... to see how this mixture fared. I have been trying to stick with Mobil products the last few years, as they always gave good rebates, and the local Rural King has great every day prices. I get regular Delvac for $7/gal (after $6/gal rebate) and the high dollar Delvac ESP Synthetic for $12/gal (after $10/gal rebate). Thats less than $30 for the oil for a synthetic blend oil change... thats awesome! Also, I know how well Delvac holds up in my truck. I have a UOA posted here somewhere, that looked great after over a year, and over 13,000 miles.... on $7/ga; Delvac 15W-40 A lot of people waste a lot of money.... changing their oil way too soon/often
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post #12 of 31 (permalink) Old 02-13-2020, 09:27 PM
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Oil is oil, pretty much, as long as it meets or exceeds the CI-4 spec. (Even after saying that, however, I personally like AMSOIL Synthetic Heavy Duty Diesel and Marine Motor Oil, designed for pre-2007 engines and is NOT rated to meet the CJ or CK specs. My local NAPA store stocks it.) More important to the specific oil is keeping it clean. Put a bypass filter on it, even if you don't plan on doing extended oil intervals. Lots of threads on the topic. You'll find that when rubbed between your fingers, oil from an engine with a bypass filter is slipperier than oil from an engine without. Oh, and don't delay in upgrading the fuel filtration, too.

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