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Old 04-09-2016, 09:54 AM   #71
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I use m one full syn in everything except the srt which gets it's recommended ow 40 full syn pennzoil. I do swap them to 10w30 instead of the 5w they call for. All show 10w30 as an optional oil in the owners manual pending temperature ranges used in.
350z high milage daily driver still has clean oil when the oil is drained during an oil change. 135k now burns no oil.
98 5.9L grand cherokee had since 98 and still has clean oil when the oil is drained. 222k on it. Burns no oil.
14 jeep srt is on a different diet 19k burns no oil.
and then the 6.0 2500 is way to early to judge. 52k and burns a touch.

I've debated on mobil one in the boat but still change it's oil with merc oem oil. No doubt a mistake.
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Old 04-13-2016, 12:05 PM   #72
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2016 RAM Laramie 4x4 with Hemi. I changed to Mobil1 and wix filter 5W30 at first oil change (5000miles). I have used mobil one since it first came out and have never had a single oil related issue. RAM says only use 5W/20 on the 5.7 Hemi with MDS but IMO during summer you really need that 5w/30. No issues.
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Old 04-13-2016, 12:27 PM   #73
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Quote:
Originally Posted by jeffdawgfan View Post
2016 RAM Laramie 4x4 with Hemi. I changed to Mobil1 and wix filter 5W30 at first oil change (5000miles). I have used mobil one since it first came out and have never had a single oil related issue. RAM says only use 5W/20 on the 5.7 Hemi with MDS but IMO during summer you really need that 5w/30. No issues.

Because you know more than Chrysler engineers.

MDS has required 5/20 for years.
Tell Chrysler, I'll bet they would void your warranty...


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Old 04-13-2016, 03:19 PM   #74
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No, because I understand the Hemi Engine and how the MDS works. 5W20 is recommended due to increased flow resistance through the lifters for the MDS to function. It may also increase your mileage a little. The same engine in the 2500, or several other vehicles that Dodge makes calls for 5W30 if they do not have MDS. I tow a heavy trailer in high temperatures in the South. My MDS works just fine and my engine is better protected better with 5w30 IMO. If you are not getting adequate oil flow through the lifters for MDS a pressure sensor will give you a check engine light. This does not harm the engine, just makes it sluggish to go into/out of MDS. You WILL know if you have this problem. This is my second RAM in ten years with MDS. I put 210K on the first one using 5/30W. Never any issues and it was not burning a drop of oil when I burned it. I will keep using my 5W30 in the summer and use 5w20 in winter when not towing. Chrysler Engineers also sign off on using Dino oil and longer change intervals. I go synthetic and change every 7500 miles.
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Old 04-13-2016, 05:53 PM   #75
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The owners manual shows 10w30 as an option if weather conditions are not extreme. At least they did in an 06 jeep commander. The owners manual of my 350z shows the same as an option in the owners manual. The commander was also a mds 5.7 hemi.

engineers also know at what age a plastic knob falls apart, brake line rust and the pressed composite leather seats fall apart. They have a 7 year business plan and part of that plan is you are back buying a new one.
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Old 04-13-2016, 06:33 PM   #76
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5w20 in the 3.6 and 5.7.

0w40 in the 6.4.


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Old 04-13-2016, 09:08 PM   #77
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0w40 Pennzoil makes for an expensive oil change on the srt. It's my only vehicle not running 10w30 mobil 1. A few owners on the srt forum are using mobil 1. I've kept mine on the srt Pennzoil via amazon so far.
Like the 5.7 in the commander the srt is noisy, typical of the hemi. I keep the srt in it's 1st level of sport mode so it prevents four cylinder mode. Neither the commander nor the srt has a dimes bit a difference in mds mpg. But it makes for a slight vibration and poor exhaust note. If i wanted a 4 cylinder.........I don't think so.
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Old 04-14-2016, 07:41 AM   #78
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I am sure I missed something,,, but does MDS stand for ???


I ask a Ford dealer about using 5w30,,, in my 5.4,,, because I had some,,, he said the engine might be a little noisier ???
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Old 04-14-2016, 08:21 AM   #79
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MDS=Multi Displacement system. Basically the engine turns off 4 cylinders out of 8 to conserve fuel during low load conditions. The 5.7 Hemi has used this since 2006. GMC uses it quite a bit in the Cadillac brand. Mercedes did (still) uses it quite often in their bigger V-8 engines. Process is controlled by hydraulic pressure...hence the discussion regarding different viscosities of oil. For example...Chrysler/Fiat "recommends" 5W20 oil in the 5.7 Hemi in the RAM 1500. This ensures proper operation of the MDS system. 5W20 however at high temperatures and loads provides less protection thus some of us prefer to use 5W30 during the summer hot months. This might, although most do not encounter this, cause the process of entering and leaving MDS to be sluggish. The engine may feel like it is running rough during the transition. The process of entering and leaving MDS takes fractions of a second and usually is not even noticed. I myself have not encountered this effect on either of the two RAM 1500's I have had.
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Old 04-14-2016, 08:35 AM   #80
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Thank You Jeff !!!
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