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Old 11-28-2021, 10:38 AM   #1
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Oil recommendations for the newbie

So what are you using and why for your early model Cummins motors. 2002 ISC 350 and others. Just the old standard Rotella T-3 or T-4 or semi synthetic?
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Old 11-28-2021, 10:40 AM   #2
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I use Rotella T-4.
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Old 11-28-2021, 11:11 AM   #3
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Rotella T4
Delo 400
Mobil Delvac
all 15/40 wt
Personally I don't see any advantage with semi or full synthetic, at least in in our situation...annual oil change or 7500 mi. Lucky to see 5k mi per year.
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Old 11-28-2021, 03:25 PM   #4
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How many really do a annual oil change?
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Old 11-28-2021, 03:54 PM   #5
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Plain old Rotella T for the last 197,000 miles
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Old 11-28-2021, 08:02 PM   #6
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Quote:
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How many really do a annual oil change?


I do.
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Old 11-28-2021, 08:20 PM   #7
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I use Valvoline Blue, buy it when it's on sale at Autozone.


Why, it is the recommended oil for Cummins, says so right on the gallon jug.



I had been changing my oil annually when we were using coach quite a bit. Then in 2016 I started building a house and didn't use the coach at all. So I took an oil sample in 2018 and all was good. Changed oil the next year. Then took another oil sample last year, all good. Changed oil earlier this year after a 5k trip, took a sample and it tested good again.
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Old 11-29-2021, 04:18 AM   #8
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I do.


Hi vettenuts how you liking that Phaeton? On my last coach w24 gasser yes I would change the oil annually but didnít know on the diesels how many were really doing it. My oil sample was good so I put off doing it till spring when I get back from FL.
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Old 11-29-2021, 04:29 AM   #9
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I do - Rotella T6, for the ISL. Also change the genset oil/filter every 100 hours
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Old 11-29-2021, 04:49 AM   #10
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Change my oil/lube filter yearly irregardless of the mileage.

Valvoline Premium Blue 15w40 usually from NAPA.

Tractor Supply usually has the best sale price if you have a store in your vicinity.

Diesels.....they love clean air, oil and fuel.
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Old 11-29-2021, 07:45 AM   #11
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I like synthetic for engines with turbos.

I'm sure the non-syn oils have improved over the years, but back when I worked as a diesel mechanic, a lot of turbo failures where attributed to oil "coking" (shutting down a hot engine too quickly) and that was happening with the old non-synthetic oils. When the "new" synthetic stuff came out that coking problem went away.

Of course other engine design changes/improvements also were happening over the same period - so cant state 100% it was the change to syn oil, but it doesn't cost much more - so that's what I use.
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Old 11-30-2021, 07:11 AM   #12
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Quote:
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Hi vettenuts how you liking that Phaeton? On my last coach w24 gasser yes I would change the oil annually but didnít know on the diesels how many were really doing it. My oil sample was good so I put off doing it till spring when I get back from FL.


We love it, quite a bit different and more complicated then the Workhorse.

I am sure that many will disagree, but I am running the T6. I also run the LF14000NN filter, which is an upgrade to the LF 9009. I have found while checking the oil every morning while traveling that it seems to stay much cleaner to the eye, which I think is the filter. Not sure how things will be in the future, but in the past I would wait for the Amazon oil sale month (August) and could get the T6 for the price of the T5. Even without the sale, the total cost increase for the ISL and the Onan generator over T4 or T5 is not that much in the grand scheme of DP maintenance.
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Old 11-30-2021, 07:56 AM   #13
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Oil recommendations for the newbie

Do we all think retail oil prices will be much higher this yr? I was at WM yesterday and they were completely cleared out of all 15w-40 T4 oil. They had some Mobil 400 and a few T5 Rotella. Who knows the shelve could be full today?
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Old 11-30-2021, 09:46 AM   #14
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I needed a quart of Transmission oil for my Jeep, T4 type. Went into a Walmart in Amarillo and had a hard time finding it, even one of the shelf stockers at ~6:30 AM couldn't find it. Why it was almost sold out. Only a small section had bottles on it. Luckily they had what I needed.



So my advice is if you think you need some in the future buy it now.
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