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To go synthetic or not?

MikeMarkCA

New Member
Joined
Sep 13, 2019
Messages
5
Location
CA
I have never run synthetic in any vehicle, but since my '03 Rubicon only has 10K on it, I have heard better to start early in an engine's life if you plan on making the switch.
How many are running synthetic, what are the pros vs cons? The only thing I know about synthetic is that it costs a lot more, but goes longer between changes. Is that the extent of it, or are there more pros?
 

hamrickac

TJ Enthusiast
Supporting Member
Joined
Jul 5, 2019
Messages
128
Location
West Virginia
Mobile one fully syn is the only oil that touches any of my vehicles. It’s probably overkill in a tj with a tractor engine Oh well
 

whitrzac

TJ Enthusiast
Joined
Feb 22, 2019
Messages
269
Location
wi
Because it's thicker and sludge doesn't leak.


'synthetic' oil is still the same dead dinosaurs, just higher quality ones...
 

Camhabib

TJ Enthusiast
Joined
Mar 30, 2019
Messages
222
Location
Boston, MA
In a high performance engine running at the very limit of what engineering is capable of, sure, synthetic all the way. For a tractor engine though, you could probably run used cooking oil and be okay.
 

Brinta

TJ Enthusiast
Joined
Jul 30, 2019
Messages
121
Location
New York
Whats good motor oil brand and grade to put in our Jeeps anyway? Synthetic and regular. Ive got 130k on my Wrangler. Should I switch to high mileage oil?
 

pagrey

TJ Addict
Joined
Apr 10, 2018
Messages
1,314
Location
Los Angeles, CA, USA
Whats good motor oil brand and grade to put in our Jeeps anyway? Synthetic and regular. Ive got 130k on my Wrangler. Should I switch to high mileage oil?
Blackstone Labs tests engine oil. Read what they have to say if you have time.

https://www.blackstone-labs.com/information/faqs/gas-diesel-questions/

The 4.0 generally uses 10w-30 or 15w-40 depending on where it is sold. Use whatever you want and be happy. To directly quote Blackstone "Buddy, you should use whatever you want."
 

reddvltj

TJ Enthusiast
Supporting Member
Joined
Apr 15, 2019
Messages
219
Location
Challis, ID
I have never run synthetic in any vehicle, but since my '03 Rubicon only has 10K on it, I have heard better to start early in an engine's life if you plan on making the switch.
How many are running synthetic, what are the pros vs cons? The only thing I know about synthetic is that it costs a lot more, but goes longer between changes. Is that the extent of it, or are there more pros?
I started running Havoline full synthetic in my '04 (bought it with 3 miles on it) at 6k miles and per their recommendations every 5 to 6 thousand after that. When I sold my Jeep in 2009 I had 70k on it and the oil was just as clean as the day I bought it. Any good oil brand will work as long as you stick to regular maintenance. The Synthetic just allows longer intervals with considerable less to no oil degradation!

The biggest advantage I can see with running synthetic is it does not brake down as fast as conventional oil. Depending on which manufacturer you use there are certain mileage warranties that they will honor so long as you keep well documented changes.

Amsoil for example warrants an engine for 1 million miles as long as you send in samples at scheduled intervals. That includes diesel engines like the 2010 Ram 6.7 liter I use on my mail route.

:unsure::unsure:
I’m not sure what you think synthetic means
Both synthetic oil and traditional motor oil are made from refining oil. Most synthetics begin with highly refined crude oil, pumped from deep underground. That is the same source as conventional oil. Other synthetic oils use artificially made compounds or a synthetic oil as a base oil. The primary difference between synthetic oil and traditional oil is at the level of refinement.
 

Flivver250

TJ Enthusiast
Supporting Member
Joined
Jun 3, 2018
Messages
992
Location
Dubai/Florida
A good quality regular oil in the proper weight will do just fine. I use Castrol, only because it was a habit I formed decades ago for all my 2 & 4 wheelers. The only oil I never liked was Quaker state. (in the 70's they had a big problem with engines seizing in cold climates, mislabeled weight). Quaker state always seemed to produce more sludge, or so I thought) . Years ago we had a customer come in with a Mercedes that used oil. No leaks. The boss said, lets use a different brand each oil change until we find one that your engine likes. I did not expect to see results. Third oil change we used Kendall. The oil consumption stopped. Chance or luck? Maybe.
 
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