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greg
Dodge Dakota
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9/10/2006
14:12:27
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 Subject: Oil Pressure when changing oils
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I just put in Mobil 1 synthetic for the first time; i used dino oils before. The first thing I noticed is that my oil pressure guage is higher than normal. Normally it sits right below the 40 on the gauge, and moves up at higher speeds. When I changed my oil to synthetic, it stays close to the high end limit of the "acceptable limit range" all the time. Is this normal/ok. I might mention that this is also the first time I have changed my own oil...yes, I paid jiffy lube to do it before.
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Bob Lincoln
Dodge Dakota
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9/11/2006
08:37:56
| RE: Oil Pressure when changing oils
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...yes, I paid jiffy lube to do it before
And now you are sludgeless!
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greg
Dodge Dakota
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9/11/2006
21:29:17
| RE: Oil Pressure when changing oils
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so the high"er" pressure is a good thing?
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shatto
Dodge Dakota
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9/12/2006
12:14:34
| RE: Oil Pressure when changing oils
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Your engine should have a relief valve to prevent too much oil pressure. You could be sure by hooking up a mechanical gauge. Buy a 'T' and leave it on the engine.
I once saw a photo of an oil filter that looked like a football because the old GM engine had developed overpressure.
Different kinds of oils may have different viscosity when running, even though the label says they are the same. Steve can answer in more detail. He went to school to learn about oil.
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kj
Dodge Dakota
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9/12/2006
19:52:25
| RE: Oil Pressure when changing oils
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The oil pressure should come down to normal when the engine is at full temperature and at idle. The only way I can think it would stay high is if you were using 15w-50.
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greg
Dodge Dakota
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9/12/2006
23:20:31
| RE: Oil Pressure when changing oils
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when engine is at full temp and idle, it does drop to just above 40, but when cold, or while moving it hovers between 2/3 and 3/4 of the way between the 40 and the end of the acceptable limit.
this maybe normal, but im used to it being slightly under 40, then go to 40 when the moving; again this may be a result of an acutal good oil change, compared to the shotty ones done at oil changing places, and the fact that im using mobile 1 intead of pennsoil or whatever they use
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B0b
Dodge Dakota
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9/13/2006
10:09:42
| RE: Oil Pressure when changing oils
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Yea, ask Stve, he has a Masters Degree in Oil
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N56629
Dodge Dakota
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9/13/2006
15:58:22
| RE: Oil Pressure when changing oils
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Different viscocities can make a difference but not different brands or who does the oil change. The change is usually small and not noticable unless you make drastic changes like going from staight 20w to straight 50w. I went to Mobil 1 and didn't notice any change in oil pressure and just slightly higher consumption. I would think that you would notice slightly less pressure if anything. Some oils seem to "warm up" quicker than others but once warm they should be about the same.
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greg
Dodge Dakota
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9/13/2006
16:55:32
| RE: Oil Pressure when changing oils
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I put it the manufacturer's recommended 10w-30, maybe they normally put in 5w-30...but that should not effect it.
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N56629
Dodge Dakota
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9/13/2006
21:11:07
| RE: Oil Pressure when changing oils
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Depending on age and condition of the engine, going from 10w-30 to 5w-30 may show a slight increase in oil pressure, especially when you first start up the engine. Once it warms up you probably won't see a difference.
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AmsoilSponsor
DakotaEnthusiast
9/14/2006
09:39:27
|  RE: Oil Pressure when changing oils
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Will synthetic oil cause oil pressure to change?
In general, when switching to a synthetic oil for the first time, you should notice a slight drop in oil pressure since synthetic's flow better.
Flow and Oil Pressure
Synthetic Lubricants usually register lower oil pressure, especially at start up. A TRUE Synthetic oil is more uniform in molecular structure (since it is made from LNG or Liquid Natural Gas and NOT crude oil) and it provides less resistance to flow - hence the lower pressure. Oil pressure is directly related to flow volume.
However, dependent upon the viscosity you use as well as the oil filter (less or more restrictive) you could witness either a slight increase or slight decrease.
Increase in Oil Presure? - Engine Maintenance?
Most of the time when we notice an increase in oil pressure, it is with engines that have not been well maintained that are switched to a synthetic oil. The increase is caused usually due to the better cleaning characteristics of synthetic's and some "crud" or "sludge" in the engine is cleaned away and winds up clogging lines or the filter.
In a newer or well maintained engine this should not be a concern. In older engines, or in situations where you don't know the maintenance history, an engine flush would be recommended prior to switching.
Additional Info -Higher RPM's using Synthetic's
Synthetic oil has better flow characteristics than petroleum oil and may cause an engines RPM at idle to increase due to decreased resistance to flow, less internal drag and parasitic losses. Often when changing to a synthetic motor oil the engine RPM may increase at idle due to decreased internal frictional resistance of rotating and sliding components.
Is Lower Oil Pressure a Concern?
For everyone experiencing slightly lower oil pressure - don't be concerned. FLOW is more important, and pressure and flow volume go hand in hand. You can have high oil pressure, however if you don’t have the proper flow volume it isn’t going to do you any good. With synthetic oil, and all other engine parameters remaining equal, it takes less oil pressure to achieve an equivalent flow volume of oil than it does with a petroleum oil, and the engine doesn’t have to work as hard to deliver the increased flow volume.
I'm sorry that I don't have a specific answer to your question. If you are concerned that the pressure is too high you might want to switch to a lower viscosity, choose a different oil filter, or have it checked out since it could be something mechanical. I am not a mechanic (but my brother is a certified gasoline and diesel mechanic and I rely on him for technical advice).
Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com
AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products
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Obio3
Dodge Dakota
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9/14/2006
15:05:18
| RE: Oil Pressure when changing oils
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I'm thinking you best get the engine flushed out by a reputable shop. unless you went to a lot heaver oil or had a lot of gas in your old oil, Things should have stayed the same or very close to it. Did you change the filter? If you had a fram filter on it or one made by fram, It may well have had a defective valve. pretty much has to be one of these problems
So many problems .... So little time
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greg
Dodge Dakota
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9/14/2006
20:34:04
| RE: Oil Pressure when changing oils
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well im not getting the engine flushed unless there is a real problem...i just paid big bucks to put in mobile 1 instead of the cheap stuff.
as for engine maintanence, i have been not the best about oil changes (im usually 1-2k miles over the recommended 3k)
But my main concern is that when I had my oil changed by jiffy lube if they did something wrong before...I know that I did a good job, good oil, good filter, good drainage. Maybe if the "problem" does not go away after 5k miles, when im ready for a change, I'll get an engine flush.
But I put in 10W-30, which is recommended by the manual, so I think if anything Jiffy Lube put in something else that caused the pressure to be lower than usual. My pressure still stays on the "higher end" of the acceptable limit, but I think my truck is running fine, so I leave it as is.
Thanks for all the info/help.
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N56629
Dodge Dakota
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9/14/2006
20:41:25
| RE: Oil Pressure when changing oils
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With 5w-20 being so common on newer vehicles it is very possible that is what they have been putting in your truck unless you specify otherwise. Even though they recommend using 10w-30 year around I use 10w-30 in the summer and 5w-20 in the winter. Even at that I don't really notice a difference in oil pressure. Pressures tend to run higher in the winter and lower in the summer. Other than that I'm happy if just looks good. I used to install real gages all the time but I've gotten away from that.
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AmsoilSponsor
DakotaEnthusiast
9/21/2006
12:30:18
|  RE: Oil Pressure when changing oils
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Interesting reading ...
Low oil pressure leads to engine failure in the Dakota/Durango.
Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com
AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products
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kj
Dodge Dakota
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9/21/2006
19:27:49
| RE: Oil Pressure when changing oils
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Greg, I wouldn't worry too much about it. My Dakota idles at full temp at below 40 psi and goes about up to 75 or so when cold or under throttle. It sounds like yours is normal. I use Mobil 1 also.
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JEcht
Dodge Dakota
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9/22/2006
12:29:41
| RE: Oil Pressure when changing oils
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what does the paper from iffy lube say on oil wieght?sounds liek they put a thicker oil like a 40W or 50W in there.
this is why I do my own OC. because you dont know what tehy do to your vehicles.
one thing you can try is take the oil filter off and get another filter and put on. then top off the oil. then see how your oil pressure is. its the most simple fix to try without dumping all your oil.
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OBIO3
Dodge Dakota
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9/22/2006
20:23:36
| RE: Oil Pressure when changing oils
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Thinking on this for a few days I beleive it's the filter. Here's the deal. Jiffy lub and other jipo oil change places use filters made special for them . There cheaper then off the shelf and also made cheaper, for them, not for you. It's all about making as much money as possible. The box and filter looks the same on outside. It keeps he customer thinking there getting what there paying for. Most of them carry other filters for the customer that is picky but the price goes up too. You most likely bought a good filter that filters better but is restricting your flow MAYBE. most likely the extra presure is causing flow to be good through a tighter filter. Your guage is running where mine has from day one. 99 4x4 CC 5.2.I use Mobil 1 EP 10-30 and mobil 1 filters. No problems and no sludge near as I can tell in my examinations. Bottom line. I think your just fine.
So many problems .... So little time
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AmsoilSponsor
DakotaEnthusiast
9/23/2006
07:36:20
| RE: Oil Pressure when changing oils
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OBIO3,
The first post stated, "this is also the first time I have changed my own oil...", so it is not the "Quickie Lube" Filter, but you are right that the filter might be the culprit. We don't know what kind of filter he chose. A PureOne Oil Filter for instance is a filter that I would never recommend. It is packed and wound too tight inside and restricts flow. Just an FYI.
Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com
AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products
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