Best Oil Choice?



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Thread: Best Oil Choice?

  1. #1
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    Best Oil Choice?

    I usually stick to the book when it comes to oil, antifreeze, etc. but have noticed a huge price difference between prices of the 5w-20 and the 5w-30, especially since the 5w-30 is available in 5qt containers.

    Basically, I just want some direction as to what some of you are using and if you would feel comfortable using the 5w-30 oil in place of the 5w-20. What do you feel are the pros and cons?

    Thanks for your help.
    2005 DGC Special Edition
    3.8L 73.5K
    Stow n Go

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    Quote Originally Posted by errivera View Post
    I usually stick to the book when it comes to oil, antifreeze, etc. but have noticed a huge price difference between prices of the 5w-20 and the 5w-30, especially since the 5w-30 is available in 5qt containers.

    Basically, I just want some direction as to what some of you are using and if you would feel comfortable using the 5w-30 oil in place of the 5w-20. What do you feel are the pros and cons?

    Thanks for your help.

    Please excuse my lack of information but with regard to the above post, I am specifically talking about the Mobil 1 Extended Performance Oil. I don't do much driving in the van, averaging about 4,000 to 5,000 miles per year.

    Thanks again.
    2005 DGC Special Edition
    3.8L 73.5K
    Stow n Go

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    If you only do 4-5k miles per year, I would not bother with Mobil 1 EP. I'd do a yearly oil change with something along the lines of Pennzoil Platinum, Mobil 1, or Motorcraft Synthetic Blend (which is readily available in 5w-20 5 qt jugs) and call it a day.

    That being said, in the case of the 3.8, I don't think 5w-30 will hurt the engine. My .02.
    Kevin Peterson
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    Your gas mileage might be a little lower but other than that you should have no problems. The owner's manual for our 05 Ford Escape 3.0L recommends 5W-20 semi-synthetic but also says you don't have to use it. I use 5W-20 Mobil 1 synthetic in the Escape because it does get better city mileage with it.
    The 94 GC 3.3L gets 5W-30 Valvoline semi-synthetic in the Winter and 10W-30 in the summer. I stock up when it's on sale at Wally World. Just my $0.02.

    FredB

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    I suspect the 5W-20 motor oil is why 3.8Ls these days are using oil. As a rule of thumb, higher torque engines can stand, and usually get, a heavier oil. Consider the 4.0L engine used in the 2008 to 2010 Chrysler minivans. The oil for that engine is 10W-30 (per Owner Manual), no if, ands, or buts for cold weather. Go figure. The recommended grade for my Jeep in-line 4.0L is 10W-30. Prior to 2005, say 2004, the oil specified for the 3.3L / 3.8L combo was 5W-30 with 10W-30 as an option. With 2005, and beyond, came the 5W-20 with puny oil filters, all in the interest of energy conservation.

    The 5W applies to "when cold" so the "hot" operating viscosity is the 20 or 30 or whatever number is last. Do some use 0W-30? Sure they do if they are looking for a "synthetic" syntheic such as Castrol 0W-30 German/European Formula. That product is available at WalMart here. The rest of the Castrol synthetic line isn't "synthetic" synthetic but is "petroleum" synthetic.

    Anyway, forget about synthetics. Just trying to make a point, ie 30 can be used where 20 is specified. See "Rreferences" below.

    Best Choice:
    For conventional oil, take a look at Valvoline Premium Conventional 10W-30 / 5W-30 / 5W-20 oil:
    - Pour Point: -36C / -42C / -42C
    - Vis @ 100C (cst): 10.5 / 11.0 / 8.5
    - Vis @ 40C (cst): 69.7 / 63.0 / 50.0

    Let's compare with Quaker State Advanced Durability Conventional 10W/30 / 5W-30 / 5W-20 oil:
    - Pour Point: -30C / -30C / -36C
    - Vis @ 100C (cst): 10.5 / 10.5 / 8.2
    - Vis @ 40C (cst): 70.3 / 63.8 / 47.7

    Between those two great brands I would go for Valvoline 10W-30 for year round use. Its pour point is lower than Quaker State 5W-30 and equivalent to Quaker State 5W-20. Next time Valvoline Premium Conventional oil is on sale, I'm loading up with 4 or 5 jugs of it.

    References:
    1. Amsoil @ http://www.worldsbestoil.ca/which-30-weight-oil.php
    AMSOIL 0W30 is 57.3 cST @ 40 C, & 11.3 cST @ 100 C

    AMSOIL 5W30 is 59.5 cST @ 40 C, & 11.7 cST @ 100 C

    AMSOIL 10W30 is 66.1 cST @ 40 C, & 11.7 cST @ 100 C
    As you can see from the data above the kinematic viscosities are extremely close. Therefore, whether you use the 0W-30, 5W-30 or the 10W-30 is strictly a matter of choice. With the small differences in kinematic viscosity you would be hard-pressed to detect these differences on initial engine start-up without specialized engine test equipment.

    All three oils are excellent motor oils and ANY one can be used in a vehicle which requires either a 0W-30, 5W-30 or 10W-30 oil as well as in several other engine applications including an engine which recommends a 5W- 20 oil.
    2. Blackstone Labs @ http://www.blackstone-labs.com/oil-viscosity.php
    Which Viscosity to Use?
    Engine owners often stray from manufacturers' recommendations regarding viscosity of oils. The engine builders dyno-test their engines using a specific viscosity oil, so when you use the viscosity they recommend, you are working with a known result. Going to another viscosity is an experiment, but it's usually a harmless one. For the sake of efficiency you want to run the lightest grade oil in your engine possible, within limits. We are seeing that trend for newer engines, for which the recommended grade is getting progressively lighter. The common 10W/30 has become a 5W/30, and some manufacturers even recommend 5W/20 oil. On the other hand, we can't see (in oil analysis) where it hurts anything to run heavier 10W/30s or even 10W/40s in modern automotive engines. The heavier oils provide more bearing film, and that's important at the lower end. If your oil is too light, the bearing metals can increase. If the oil is too heavy, the upper end metals can increase. The trick is to find the right viscosity for your particular engine, which is why we suggest following the manufacturer's recommendation.
    Last edited by Jeepman; 04-05-2012 at 01:09 PM.
    2007 GC SXT - Magnesium - S&G - 3.8L - 115,600 kms
    2002 GC Sport - Stone White - 3.3L - 314,240 kms
    2003 Jeep TJ Sport - 4.0L - 246,430 kms

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    I use 5w30 in my 2005 and it gets better fuel mileage than my 2007 that I have to use 5w20. I dont' believe that 5w30 or 10w30 would make much of a diference. I agree with Jeepman and suspect he is right about the durability difference.
    Hank
    07 Dodge Caravan SXT 3.3L Gold 105,000 kms
    05 Dodge Caravan SE 3.3L Silver 165,000 kms

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    Found Mobil 1 Extended Performance 5W-20 in Walmart last Saturday in a 5 Qt container.

    I have Mobil 1 Extended Performance 5W-20 in the van right now, I can say that it is much better than the regular Mobil 1 after 6000 miles of hard work (very short trips, cold starts, steep hills, fast highway driving,,,etc. )

    The van is due for an oil change but I will go with the Castrol Edge Titanium this time and let's see.
    2005 - Dodge Grand Caravan - SXT (3.8L) ~~ 125 k miles

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    Castrol Edge Titanium @ http://www.castrol.com/liveassets/bp..._april2011.pdf

    Pour Points are comparable to Valvoline Premium Conventional oil. This is likely a "petroleum" synthetic, not a "synthetic" synthetic.
    2007 GC SXT - Magnesium - S&G - 3.8L - 115,600 kms
    2002 GC Sport - Stone White - 3.3L - 314,240 kms
    2003 Jeep TJ Sport - 4.0L - 246,430 kms

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    What is a synthetic synthetic. Don't they all start with petroleum? If not then what?

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    What is a synthetic synthetic. Don't they all start with petroleum? If not then what?
    Conventional Oil: Made from Group ll petroleum base stocks (dino stuff). Now days, although not stated, they also contain some Group lll petroleum base stocks.

    "Petroleum" Synthetics: Known as Synthetics in North America, but not considered a synthetic in Europe as they are made from highly refined Group lll petroleum base stocks (still dino stuff). Examples are Pennzoil Ultra, Castrol Edge except for 0W-30 below.

    "Synthetic" Synthetics: Petroleum free Polyalphaolefin (PAO). Examples are Castrol Edge 0W-30 European Formula, Amsoil Signature Series, Mobil 1 Extended Performance 0W-40

    Polylphaolefin (PAO): http://en.wikipedia.org/wiki/Polyolefin

    The Dilemma: http://www.ultimatesyntheticoil.com/...an_engines.htm
    Looking at this from yet another perspective, the United States is the only major market in the world where Group III petroleum oil can be legally labeled as synthetics. While this clever 1999 maneuver allowed a flood of petroleum "synthetics" to hit the market and command much higher profits by undercutting the manufacturing costs of true synthetics, it may well be contributing to European-vehicle engine problems. Some vehicle owners, even those aware of the need for high-performance oils, may be using these API Group III "synthetic" oils while assuming their engine will be protected. In reality, those oils are only marginally better than their cheaper siblings, and almost none of them meet the ACEA specifications. Perhaps Mercedes-Benz should consider a lawsuit against the oil companies for deceiving the American public and directly contributing to these problems.
    2007 GC SXT - Magnesium - S&G - 3.8L - 115,600 kms
    2002 GC Sport - Stone White - 3.3L - 314,240 kms
    2003 Jeep TJ Sport - 4.0L - 246,430 kms

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