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Oil Change Ready to change the oil in your Dodge Ram? Engine -Trans - Differential - Transfer Case


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  #1  
Old 10-01-2011, 12:14 PM
belle belle is offline
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Default Synthetic oil?

I replaced the original oil with a synthetic oil and have noticed a drop in mpg. I thought there would be an increase in mpg. Am I right or wrong?
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Old 10-01-2011, 12:24 PM
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What weight? If it is thicker, then I would say that is normal.
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Old 10-01-2011, 08:27 PM
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i have never noticed an mpg gain from synthetic oil, but i also have never heard of an mpg loss, as stated did you use the 5-20wt as specified by dodge?
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Old 10-01-2011, 09:00 PM
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I'd be curious as to what weight you went with as well.
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Old 10-01-2011, 09:02 PM
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& which oil filter brand
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Old 10-02-2011, 02:10 AM
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Most conventional is designed to shear to meet the energy conserving standards. The reference oil for the test is a synthetic. That basically means they have to shear enough to beat it to get the energy conserving label.

I think Ford claimed about 2% difference in fuel mileage between 5W30 and 5W20 so you might see another 1% by switching to 0W20 Synthetic almost all coming in the first 20 minutes as viscosity will be almost identical at operating temp.

It would be tough to notice the 0.15 mpg change in daily driving.

PS The increase in average wind speed and lower evening temps that have occurred with the changing season will have more than offset any gain you may have gotten.
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Old 10-02-2011, 03:06 AM
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with oils, the only thing that counts after warm up, is the LAST number

the number before the W, which means WINTER, only matters at initial start up

SAE 5 W - 20 only means that the oil gives proper lubrication at 5 degrees F, the 20 means that the oil lubricates at 20 weight at normal temperatures

SAE 0 W - 20 means that the engine gets lubed properly at the start up temperature of 0 F & does not get thinner than 20 F at normal running conditions
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Old 10-02-2011, 02:05 PM
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i use synthetic always.they only way milage would go down is that i could see would be if u put synthetic into a high milage motor and the oil cleans and dislodges some crud/sludge/carbon and it gets stuck in a moving part ie valve stuck open.you have a new engine so thats not the case. i would say give it a little more time not just 1 tank maybe you have a little bit of not so good gas ie water in tank.been using your air condition more or tire pressure a bit lower or extra weight in truck every 100lbs makes a differance.maybe wife gaining more weight then you think(jus kidding)
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Old 10-03-2011, 06:38 AM
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Default synthetic oils

Regardless of any actual differences between dino vs. synthetic, I perceive that syn is better because of claims that it flows better in cold weather, lasts longer between changes, stands up to higher temps better and will keep my engine running stronger and longer for years to come. I use it exclusively in all my vehicles, and even my lawnmower.
Probably in my case where I seldom reach the recommended mileage interval for a change within a years time, and sometimes let the date slip, a synthetic justifies the additional cost and gives me peace of mind.
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Old 10-03-2011, 11:45 AM
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Quote:
Originally Posted by GTyankee View Post
with oils, the only thing that counts after warm up, is the LAST number

the number before the W, which means WINTER, only matters at initial start up

SAE 5 W - 20 only means that the oil gives proper lubrication at 5 degrees F, the 20 means that the oil lubricates at 20 weight at normal temperatures

SAE 0 W - 20 means that the engine gets lubed properly at the start up temperature of 0 F & does not get thinner than 20 F at normal running conditions
You are correct about the LAST number being the one that matters for operating temperature but I believe your info on the "w" number is incorrect. The terms 0w and 5w do not directly correlate with temperature, they are merely a designated rating based on the cold temperature testing of oil. Currently the grades are given based on a combination of the cold cranking viscosity and pumping abilities of the oil. 5w oil is able to crank at -30C; 0w is able to crank at -35C. Those temperatures are extreme and do not mean you will get proper lubrication at those temperatures, however the better the low temp qualities of an oil the better it will flow at lower temps. With synthetic oil there is still an advantage to the lower "w" number even in moderate climates. No oil however gives the full required lubrication until operating temperature is reached.
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Last edited by highlandchef; 10-03-2011 at 11:56 AM.
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