Switched to Rotella 15W40 - JeepForum.com
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post #1 of 139 Old 08-05-2014, 07:21 PM Thread Starter
clayduster71
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Switched to Rotella 15W40

I switched a few thousand miles ago to Rotella 15w40. I have been pretty impressed with the results of making this move:
- Puddle of oil from rear main leaking each morning under jeep completely gone
- Lifter noise completely gone
- Gas mileage exactly the same
- No difference in perceived power

I have 120k on this 2005 LJ. It may not be the perfect oil for this engine, but it sure did correct issues that I've been having with it.

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post #2 of 139 Old 08-05-2014, 07:47 PM
2jhanna
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How long/bad was the RMS leaking before the 15/40?

Have you washed off the underside to see if it has really stopped?

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post #3 of 139 Old 08-05-2014, 08:42 PM
Andy5150
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My diesel Silverado loves it, but when I was trying to cure the 4.0 lifter tick, it didn't do the job. Its great oil, and a lot of people have had good results, but for me, it was Mobil 1 10/30 High Mileage that did the job long term.I tried 15/40 Rotella, and about 4 other oils, and the tick always returned after a few weeks. If it keeps your motor quiet between oil changes, stick with it.
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post #4 of 139 Old 08-06-2014, 12:01 AM
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I found 15w40 rotella make my tick worse, especially on cold start ups. 5w40 rotella though, worked great.

I currently run mobil 1 5w30 synthetic because I got a bunch of it on a great deal.
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post #5 of 139 Old 08-06-2014, 04:15 AM Thread Starter
clayduster71
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Yes, I did wash the engine. I had to put a piece of cardboard under my jeep to keep the oil off the concrete in my garage. There used to be a spot under it about the size of the end of a beer car each morning. Since I switched to Rotella 15W40, no spot at all on the new cardboard.
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post #6 of 139 Old 08-06-2014, 08:12 AM
Jwinecoff00
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Quote:
Originally Posted by clayduster71 View Post
Yes, I did wash the engine. I had to put a piece of cardboard under my jeep to keep the oil off the concrete in my garage. There used to be a spot under it about the size of the end of a beer car each morning. Since I switched to Rotella 15W40, no spot at all on the new cardboard.
That's a pretty substantial leak! Hope it doesn't return.. I just did the RMS job a few weeks ago and it's not so bad really.

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post #7 of 139 Old 08-06-2014, 04:11 PM
RandyTJ
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Quote:
Originally Posted by clayduster71 View Post
I switched a few thousand miles ago to Rotella 15w40. I have been pretty impressed with the results of making this move:
- Puddle of oil from rear main leaking each morning under jeep completely gone
- Lifter noise completely gone
- Gas mileage exactly the same
- No difference in perceived power

I have 120k on this 2005 LJ. It may not be the perfect oil for this engine, but it sure did correct issues that I've been having with it.
Kind of ironic..........In my past two Jeeps , for the last 12 years I have been using Rottela 15w40.

About six months ago I switched over to Quaker State Defy 5w30.........so far so good.

I figured I would get a little easier starting in cold weather, maybe slight increase in gas mileage, and a little more protection on the flat tappet engine.

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post #8 of 139 Old 08-06-2014, 06:21 PM
arg0413
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That is way too thick of an oil to run in that engine. Your masking the tick and the leak with Molasses lol You can cause substantial start up wear with an oil that thick, it takes much longer for the viscosity to change and it actually work from start up. Read all 10 chapters from this lubricity engineer, it's very insightful:

http://www.bobistheoilguy.com/motor-oil-101/

I personally run 5W-30 Mobil 1, 0W-30 when I can find it. If your set on running a 40W oil, run a 5W-40, not a 15W-40.
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post #9 of 139 Old 08-06-2014, 06:27 PM
Vettster
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Originally Posted by arg0413 View Post
That is way too thick of an oil to run in that engine. Your masking the tick and the leak with Molasses lol You can cause substantial start up wear with an oil that thick, it takes much longer for the viscosity to change and it actually work from start up. Read all 10 chapters from this lubricity engineer, it's very insightful:

http://www.bobistheoilguy.com/motor-oil-101/

I personally run 5W-30 Mobil 1, 0W-30 when I can find it. If your set on running a 40W oil, run a 5W-40, not a 15W-40.
I don't usually respond to oil threads but my 06 Rubicon calls for 15-40 in the owners manual.
I use 15-40 Royal Purple.
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post #10 of 139 Old 08-06-2014, 06:34 PM
arg0413
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I don't usually respond to oil threads but my 06 Rubicon calls for 15-40 in the owners manual.
I use 15-40 Royal Purple.
My '97 Calls for 5W-30, same engine! Do you know the difference between a 15W-40 and a 5W-40? They are both 40W oils, the difference is the viscosity when cold, which drastically affects wear and tear on the engine. There is no reason to ever run a 15W-40, only negative effects will be gained by such actions.

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post #11 of 139 Old 08-06-2014, 06:45 PM
Vettster
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Originally Posted by arg0413 View Post
My '97 Calls for 5W-30, same engine! Do you know the difference between a 15W-40 and a 5W-40? They are both 40W oils, the difference is the viscosity when cold, which drastically affects wear and tear on the engine. There is no reason to ever run a 15W-40, only negative effects will be gained by such actions.
Yes. I know the difference. It's what the owners manual calls for.
Mine is an export model sold in Mexico.
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post #12 of 139 Old 08-06-2014, 09:49 PM
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Yes. I know the difference. It's what the owners manual calls for.
Mine is an export model sold in Mexico.
Yeah, I doubt you see anything as low as -20 C there to warrant a thinner oil. My guess is the manufacturer knows what they're recommending.
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post #13 of 139 Old 08-06-2014, 11:01 PM
Vettster
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Yeah, I doubt you see anything as low as -20 C there to warrant a thinner oil. My guess is the manufacturer knows what they're recommending.
My point "zactly".
We don't do -20 here.
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post #14 of 139 Old 08-06-2014, 11:50 PM
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Quote:
Originally Posted by arg0413
My '97 Calls for 5W-30, same engine! Do you know the difference between a 15W-40 and a 5W-40? They are both 40W oils, the difference is the viscosity when cold, which drastically affects wear and tear on the engine. There is no reason to ever run a 15W-40, only negative effects will be gained by such actions.
I guess I've been lucky for 14 years and 130.000 miles, that's how long I've been running 15-40 Rotella in mine, no noises and runs like a sewing machine.
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post #15 of 139 Old 08-07-2014, 02:50 AM
Robert J. yates
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15/40 is actually export spec.... We get a thin oil to meet cafe standards here. I ran Rotella T for awhile for the enhanced ZDDP package until they downsized it. No issues here ever with it.
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