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  #13  
Old 08-15-2011, 06:04 PM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

I have run Amsoil 0w-20 in both my Hemi's; one has 14,0000 and the other 17,000 miles. I just changed oil in both again, we are moving to MA and didn't want to mess with it later. Runs great and the extended drain intervals are nice.
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  #14  
Old 08-15-2011, 08:27 PM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

I run 5W-20 Castrol Edge (synthetic) and Amsoil EA048 oil filters on my 5.7 with MDS. Change em' every 5 months or 5500 miles. Issue here is 75 dollar oil changes but, for a 40K+ vehicle....cheap insurance in my book....


FYI....further research indicates that Jeep can (and will most likely) void your warranty if you do not follow the owners manual: You must change the oil every 6 months or 8K miles...period....pg 540

NOTE:
The oil change indicator message will not monitor the
time since the last oil change. Change your vehicles oil
if it has been 6 months since your last oil change even
if the oil change indicator message is NOT illuminated.

Change your engine oil more often if you drive your
vehicle off-road for an extended period of time.

Under no circumstances should oil change intervals
exceed 8,000 miles (13,000 km) or 6 months, whichever
comes first.

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  #15  
Old 08-16-2011, 07:52 AM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

Quote:
Originally Posted by mjw930 View Post
I'll expand a little since I re-read your original post. The comment about the molecules bonding to the metal was so far out in left field that I ignored it until I noticed it was an Indy shop that specializes in German vehicles. I have had run ins over the years with some of these Germain vehicle Indy shops coming up with all kinds of urban legends regarding oil, filters, gas, you name it. About the only place worse are Harley mechanics who still cling to the urban legend that synthetic oil is "too slippery"....... LOL

Modern synthetics are simply better at doing what a motor oil is supposed to do than anything that has come before. There is no argument to this previous statement that can stand the test of science, none. While there may be some older engines that need more zinc and other minerals than is currently allowed in modern motors that argument doesn't counter my statement. There's a corollary that is true as well, modern non-synthetic are also better at doing what they are designed for than their predecessors. With that being said, NEITHER oil will cause harm so what you use really comes down to what YOU think is the best thing for your motor.

BTW, the problem with seals about 20 years ago WAS partly due to the type of synthetics being produced. Some of the early Group V or Non-PAO based synthetics caused seal degradation do to the corrosive effects of diesters, polyolesters, alklylated napthlenes, alkyklated benzenes, etc. Currently, all main stream "100% synthetic" oils are made from a combination of Group III and Group IV Polyalphaolefin (PAO) base stock that do not degrade plastics AND are molecular compatible with mineral oil so they can be mixed without significant harmful effects.
mjw930, thank you for your detailed explanation. It does make sense to me. I was leaning toward using synthetic but I wanted to put the question out there for (hopefully) unbiased feedback.

Thanks again to all that responded.





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  #16  
Old 08-16-2011, 06:29 PM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

Why not a dollar each way? Use Semi Synthetic.
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  #17  
Old 08-16-2011, 08:11 PM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

From what I've read on a dedicated oil forum, MDS in the 5.7L works better with Synthetic oil. So go for 5W-20 full synthetic...or 0W-20.
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  #18  
Old 08-17-2011, 07:46 AM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

The dealer changes my oil so whatever they throw in there is fine for me. My MDS still works so I guess they put the right weight in.

Is anyone going to know the difference between synthetic and regular oil if they change it even twice a year and sell the car in 5 years or so?
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Old 08-17-2011, 08:01 AM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

Quote:
Originally Posted by 77rednecktruck View Post
The dealer changes my oil so whatever they throw in there is fine for me. My MDS still works so I guess they put the right weight in.

Is anyone going to know the difference between synthetic and regular oil if they change it even twice a year and sell the car in 5 years or so?
NOPE!
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Old 08-17-2011, 08:06 AM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

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Originally Posted by mjw930 View Post
NOPE!
cool, I get bored with cars after a few years so I am good to go.
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Old 08-17-2011, 11:23 AM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

Quote:
Originally Posted by 77rednecktruck View Post
Is anyone going to know the difference between synthetic and regular oil if they change it even twice a year and sell the car in 5 years or so?
Only if you are anal about mpg and peak HP/torque (less friction less power loss)... or subject the Jeep to high temp and loads (routinely run to the rev limiter), or lose oil pressure momentarily while performing high G maneuvers .

Synthetic makes more of a difference in some other vehicles, e.g. my Duc transmission shifts smoother (quicker) when running synthetic which adds to my riding satisfaction.
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Old 10-14-2011, 10:05 PM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

Almost 2,000 miles on my 2011 5.7 and I'm going to embark on an extended winter stay in the subzero temps of Minnesota. Going to take the dealer up on a free oil change before I leave. Can I safely switch to synthetic oil at 2,000 miles ?
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  #23  
Old 10-15-2011, 03:05 PM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

My 2003 Saab 9-3T Arc has 118,000 miles on it and still runs great after having its Mobil 1 synthetic oil changed every 15,000 miles. Yes, it has a high revving four cylinder turbocharged engine and has gone 15,000 miles on every oil change. I can't recommend synthetic oil enough.
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Old 10-15-2011, 03:25 PM
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Re: Synthetic vs. Conventional Oil, which to use 5.7L

Quote:
Originally Posted by JeffK View Post
Almost 2,000 miles on my 2011 5.7 and I'm going to embark on an extended winter stay in the subzero temps of Minnesota. Going to take the dealer up on a free oil change before I leave. Can I safely switch to synthetic oil at 2,000 miles ?
Yes absolutly some switch at 500 miles
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