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Old 12-14-2019, 11:32 PM
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Synthetic vs Conventional Oil

I know synthetic oil is better and as engines get worn out conventional is better because it doesn't leak as much because it is thicker. My question for the guys that have the jeep as a second vehicle or weekend toy. I only drive mine 6,000 miles or so a year. I have a work truck and another for pulling the boat. Which oil is better for vehicles that sit for days? I know once the engine is warm both oils will protect good. On start up I would guess synthetic would flow faster. But because it is thinner would it drain off the top of the engine faster and create more dry starts? I have always used conventional oil, but I have had older engines. My personal truck has 280,000 miles, my previous truck had 272,000 when I sold it. So it's been a while since I had vehicle in the 100K mile range.

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Old 12-15-2019, 02:14 AM   #2
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Old 12-15-2019, 05:31 AM   #3
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With the mileage you are quoting on your other vehicles what ever your using seams to be working, if it aint broke don't fix it.
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Old 12-15-2019, 08:09 AM   #4
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My reading of oil differences is synthetic oil molecules are all uniform in size, whereas Dino oil has irregular molecule sizes. So this is why you might see more leaks from synthetic over Dino.
One thing I’ve never seen is moldy or spoiled oil, so it can sit unused for years. There’s no expiration date on the cans either. Just food for thought.
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Old 12-15-2019, 08:34 AM   #5
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Im imagine you know the story with todays "synthetics" as in the Mobil 1 vs Castro, court case. My opinion is use 5/30, not 10/30 which helps to pump after a sit or in colder weather. You're getting great service from whatever your doing now also. I myself now use Walmart or store labeled synthetics in the vehicles. Just a heads up, the AP stores in my neck of the woods sell conventional oils for $5 to $7 a quart, even basic Chevron Supreme 5/30. It pisses me off when Home Depot or the local ranch supply, right next door to an Orieleys, no less sells the same Chevron 5/30 for $2.99 a quart.
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Old 12-16-2019, 11:34 AM   #6
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I change mine every 2000 miles because I don't quite get to 3000 miles in a year. Mobile 1 10w30 is cheap when on sale at Costco.
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Old 12-17-2019, 07:44 AM   #7
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10W-30 Conventional every 3k miles for me. Whatever is on sale. Usually Pennzoil or Valvoline. No drips in the driveway. I have had the 05 Rubicon almost 2 years. Bought it at 183k miles. I run about 1k per month pretty consistently, so my 3k mile changes come up right on the 3 month mark. I am turning 206k miles in a week or so. Runs great!
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Old 12-17-2019, 09:04 AM   #8
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Self, why can I only go 3000 miles on conventional oil when I can go 10,000 miles between synthetic oil changes ?
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Old 12-17-2019, 02:27 PM   #9
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Originally Posted by pkdailey4 View Post
Self, why can I only go 3000 miles on conventional oil when I can go 10,000 miles between synthetic oil changes ?
Buy M1 extended wear whatever, and go 25,000 miles between rebuilds. Now that make me giddy all over!!!.
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Old 12-17-2019, 07:17 PM   #10
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Self, why can I only go 3000 miles on conventional oil when I can go 10,000 miles between synthetic oil changes ?
If you want to believe you can go longer between oil changes with synthetic based on claims, especially from MLM companies like Amsoil, go right ahead. The oil may technically last that long but that's not the whole story.

What you're not thinking about is the reason to change your oil isn't because the oil has "worn out", it's because the oil has become dirty from use... combustion chamber byproducts, naturally occuring engine acids, dirt, etc. which cannot be totally filtered out by the oil filter. The only way to get rid of those harmful contaminants is to change the oil. They collect at the same rate whether the oil is a synthetic or a conventional.
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Old 12-19-2019, 02:27 PM   #11
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I looked it up(googled) Walmart/amazon/other generic synth.oils are all made by a co.in penn.doing oil since the 30'sand a jug of it runs $15 here 10w/30 so I run that and change between 3 and 5 k mi.and it always comes out looking clean.....
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Old 12-20-2019, 01:20 PM   #12
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If it always comes out looking clean then either your changing much to soon or the oil is doing a poor job of removing and holding contaminants from your engine.
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Old 12-20-2019, 04:13 PM   #13
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Walmart, Costco, Amsoil, etc. don't have drill rigs and refineries. Saying that their oil is 'the best' can only apply to 'best price'
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Old 12-20-2019, 05:22 PM   #14
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Originally Posted by Jerry Bransford View Post
If you want to believe you can go longer between oil changes with synthetic based on claims, especially from MLM companies like Amsoil, go right ahead. The oil may technically last that long but that's not the whole story.

What you're not thinking about is the reason to change your oil isn't because the oil has "worn out", it's because the oil has become dirty from use... combustion chamber byproducts, naturally occuring engine acids, dirt, etc. which cannot be totally filtered out by the oil filter. The only way to get rid of those harmful contaminants is to change the oil. They collect at the same rate whether the oil is a synthetic or a conventional.
Just shuckin Jerry on the 25K oil Intervals. Although there are those who believe thats adequate I never go over 5k on any oil regardless of type or brand. I dont use Amzoil, and Mob 1 doesn't particularly give me a warm fuzzy feeling all over. Good old 5w30 Valvoline or Chevron Supreme if I can find it is my #1 choice. I do admit to using Wallace Martell synthetic in the Nissan being it only holds 3.8 qts.
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Old 12-20-2019, 09:02 PM   #15
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Synthetic vs Conventional Oil

So, I’ll toss out another option, which is what I do on my 95 2.5L.

1qt Royal Purple
3.5 quarts Valvoline or Shell Rotella if the Shell is on sale.

I get the cleansing power and benefits of the Royal Purple and the low cost of the conventional.

Makes me sleep good at night if nothing else.

I also run a Motorcraft FL1A filter, which is how I get the extra half quart.

I have owned my Jeep just over a year and have changed the oil once. The PO has a local shop change it. No clue on its history, but my valve train and timing gears were spotless when I checked into it after purchase.


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Old 12-21-2019, 10:27 AM   #16
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I'll bet the Rotella has more detergent than any of the "gas" type rated Syn oils. Diesel oils typically have a pretty heavy additive pack due to the nature of the beast.
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Old 12-22-2019, 01:28 PM   #17
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^^^ problem is many diesel rated oils additive package Do not contain friction reducing additive so they can be used in in applications with engine oil bathed clutches [Motorcycles ATVs side by sides etc] also added Zink [not needed in gasoline roller lifter engines and murder on cats]. I use Rotela T in all my ATVs But would not recommend it for a Penta*

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