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Synthetic vs. Regular #855344 12/28/07 01:36 AM
Joined: Feb 2005
Posts: 402
Cen_Tex_KIA Offline OP
Mudrunner
Ok,
I Bought a 2001 xj with 115k on it. I want all the fluids flushed. The local "Jippy" lube says it has synthetic fluids......verrry expensive. Should I let them do the Synth. in the T-case and the diffs. Or do it myself and go with traditional fluids.
All opinions and experiences appriciated! <img src="/forums/images/graemlins/shiner.gif" alt="" />


2000 KIA Sportage 4x4, Sadly Smushed! Now a 2001 Cheep Jerokee. 3" Rough Country Lift, 255/70/16 General AT2's
http://www.cardomain.com/ride/2292811
From the Off-Road World
Re: Synthetic vs. Regular [Re: Cen_Tex_KIA] #855345 12/28/07 02:22 AM
Joined: Oct 2002
Posts: 466
jstritec Offline
Mudrunner
normal stuff should do you fine.



80 CJ-7.
It runs
Re: Synthetic vs. Regular [Re: jstritec] #855346 12/28/07 02:30 AM
Joined: Oct 2003
Posts: 7,768
BigJim Offline
Web Wheeler
Since it lasts so long in the tranny and diffs I'd be using it there.. However in my engines I change the oil often enough that I don't use anything special in them.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />


professional bovine relocation specialist
Re: Synthetic vs. Regular [Re: BigJim] #855347 12/28/07 04:55 AM
Joined: Jan 2007
Posts: 353
playinmud Offline
Mudrunner
wooooah let me get in on this, you guys should all try amsoil, amazing stuff, if you change your oil and filter every 3 months or 3,000 miles like they recommend, you spend well over $75 a year to do it, but if you buy amsoil and get an amsoil filter you can go one year or 25,000 miles on an oil and filter change, which will only cost you around $45, plus its less time you need to spend under your vehicle and more time chasing the ladies or doing your favorite hobbies. i put amsoil sythetic in the engine, trans, transfercase, and diff's and got a 2mpg increase, and i noticed my jeep wasnt as sluggish for the first couple blocks on cold mornings. everyone i know that has a manual trans and uses this stuff says its ten times easier to shift when cold. give this stuff a try, you wont be disappointed


WHEN THE ROAD ENDS, THE FUN BEGINS

97 sahara, 4in skyjacker lift, 33in tires, borla header & catback, 10in subs
Re: Synthetic vs. Regular [Re: Cen_Tex_KIA] #855348 12/28/07 08:41 AM
Joined: Sep 2005
Posts: 1,087
BobRowe Offline
Body Damage is Cool
If you're not going to be doing much offroad driving in your Jeep, then you can use the synthetic stuff, because it ;asts a fairly long time.

However, if you're going to be doing a fair amount of off-road driving that includes water crossings, then you will be changing the fluid in at least the diffs after fairly deep water crossings - maybe even in the other driveline components. That would be a waste of money then, so I'd use the normal stuff in that case.

Keep in mind that the vehicle was probably designed for non-synthetic stuff, so you're not likely to go wrong in using it. The synthetic stuff is nice in some situations, but it's certainly not necessary. Keep in mind that the profit margin is higher for the Jiffy shop on the hi-end oils, so of course he's going to recommend those to you.


1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.
Re: Synthetic vs. Regular [Re: BobRowe] #855349 12/28/07 05:14 PM
Joined: Oct 1999
Posts: 2,211
S
superdawg Offline
Body Damage is Cool
Amsoil is good stuff, but 25K? for service interval? I would never let that happen. Two things about long oil change intervals.

One, the same acids, sludges and hydrocarbon crap forms in a top synthetic as forms in a dollar store ultra cheap oil and in the same amount of time. This depends on the condition age/miles of the motor.
Conclusion, the same stuff that creates the need for changing oil every 3k is the same with any oil.

Two, if you are the guy who buys the very best oil money can buy for your "baby", the last thing you should do is find out the hard way that saving $20-40 a year in oil changes just cost you a engine rebuild.

Newer manual transmissions seem to like thinner/lighter weight oils than the oe recomendations. AX15 during the summer will shift fine on the 80-90 gear oil that the service manual recomends, try shifting thru that pancake syrup in 0 degree temps. I use either durablend gear oil or in cases where they are already hard to shift and the tranny is not long for the world, 10-30 motor oil works great.

SD

Re: Synthetic vs. Regular [Re: superdawg] #855350 12/29/07 01:56 AM
Joined: Jan 2007
Posts: 353
playinmud Offline
Mudrunner
Quote
Amsoil is good stuff, but 25K? for service interval? I would never let that happen. Two things about long oil change intervals.

One, the same acids, sludges and hydrocarbon crap forms in a top synthetic as forms in a dollar store ultra cheap oil and in the same amount of time. This depends on the condition age/miles of the motor.
Conclusion, the same stuff that creates the need for changing oil every 3k is the same with any oil.

Two, if you are the guy who buys the very best oil money can buy for your "baby", the last thing you should do is find out the hard way that saving $20-40 a year in oil changes just cost you a engine rebuild.
Newer manual transmissions seem to like thinner/lighter weight oils than the oe recomendations. AX15 during the summer will shift fine on the 80-90 gear oil that the service manual recomends, try shifting thru that pancake syrup in 0 degree temps. I use either durablend gear oil or in cases where they are already hard to shift and the tranny is not long for the world, 10-30 motor oil works great.

SD


amsoil guarentee's their oil, if anything on your motor breaks and it can be proven that it was because of their oil, they fix it for free, but guess what, no one has complained, do u think they would guarente their oil for that long if it wasnt good enough to last that long? my brothers 87 grand national has had amsoil in it since the day my uncle brought it home from the dealership, the oil has been changed once a year, this past summer my brother pulled the vavle covers off to change the valve springs and it looked like a brand new motor, there was absolutly no sludge at all


WHEN THE ROAD ENDS, THE FUN BEGINS

97 sahara, 4in skyjacker lift, 33in tires, borla header & catback, 10in subs
Re: Synthetic vs. Regular [Re: playinmud] #855351 12/29/07 09:16 AM
Joined: Jan 2000
Posts: 1,817
F
Fred Blackstone Offline
Body Damage is Cool
Advantages of Synthetic
Synthetic oil was originally developed for high performance racing engines. Mobil tried to popularize synthetic oil for passenger vehicles back in the early 1970's. At the time, Mobil was promoting 20K or 25K oil changes with synthetic, but they soon backed down from this. Synthetic oil is a good choice if you have a vehicle with a high performance engine (in fact synthetic is required for many of these engines). It is also a good choice if your vehicle is operated in extremely cold climates. It has higher resistance to breakdown caused by heat and it flows better in extreme cold. Unfortunately for the synthetic oil industry there is virtually no advantage to using synthetic oil in a non-high performance engine that is operated in moderate climates. You probably could go a bit longer between oil changes with a synthetic, i.e. following the normal service schedule even if you fall into the severe service category, but I wouldn't advise this. In short, synthetic may give you the peace of mind of knowing that you are using an oil that is far better than necessary for your vehicle, but it won't reduce wear or extend the life of the engine. The mistake some people make it to wrongly extrapolate these benefits onto normal engines operated in mild climates, with the ultimate lack of any knowledge being manifested with statements such as "synthetics provide 'Peace of Mind,' or 'Cheap Insurance,'" or other such nonsense.

Extended Change Intervals
Most manufacturers of synthetic oil advise users to not exceed the manufacturer's recommended oil change interval. Part of this is self interest (they don't want to be liable for any damage) but the real reason is that synthetic oil, while it does have certain advantages, still becomes contaminated.

Be extremely wary of synthetic oil companies that offer to pay for your repairs if it is determined that their oil and their extended change interval recommendation caused the problem. Think for a moment of the incredible hassle you would have to go through to prove responsibility for an engine problem. Who would pay your legal bills? Who would pay for replacement transportation during the battle? The more bizarre the warranty the poorer the product is a good rule of thumb. -http://www.nordicgroup.us/oil.htm


94 YJ, SOA, 2-1/2 Alcans, ARB-front, Detroit-Rear, 4.56:1 gears, Oasis Trailhead compressor, 4:1 Terra Lo, 37x12.50x15 SSR's, 8000 lb Ramsey, & etc.
Re: Synthetic vs. Regular [Re: Fred Blackstone] #855352 12/29/07 04:17 PM
Joined: Jan 2007
Posts: 353
playinmud Offline
Mudrunner
since my brother is an amsoil dealer i know this stuff, all amsoil simply does is has you send in a sample of your oil to blackstone and they determine if the oils bad and caused the problem. we run amsoil in the 11 cars we own and they get an oil change once a year, my father also owns a machinery moving bussiness with 10 semis and about 25 forklifts, they all have amsoil and recieve oil changes once a year, none of these engines have ever had a problem, have you ever tried amsoil? have you ever did any research on they're products? the guy who started mobile one used to work for amsoil, amsoils used in all the military planes because its the only oil that doesnt deteriorate, try it for a year and then if you decide you dont like tell me its *****, but until you try it you have no clue weather or not its the same as every other synthetic out there


WHEN THE ROAD ENDS, THE FUN BEGINS

97 sahara, 4in skyjacker lift, 33in tires, borla header & catback, 10in subs
Re: Synthetic vs. Regular [Re: playinmud] #855353 12/29/07 05:31 PM
Joined: Oct 1999
Posts: 2,211
S
superdawg Offline
Body Damage is Cool
Quote
try it for a year and then if you decide you dont like tell me its *****, but until you try it you have no clue weather or not its the same as every other synthetic out there


Don't take it personaly, it's not about amsoil, its about service intervals and what oil to use. They say spark plugs can last 100k miles, I believe that they can...however would I test that, should you test that? One could, who cares? I wouldn't.
There is more to service intervals than oil changes and how often they are done. If you get under the hood every 3k you stand a chance of finding that cracked belt or squishy hose and be able to fix those sorts of problems before they cause a breakdown.

My BG rep shows me all kinds of data about the wonders of BG products (most are excellent) but that data and stats will not change how and when I service my rigs or customers rigs. Just because a stat says that my service interval can now be a year, instead of 3 months, will not make me any more likely to want to be a test subject with my transportation. Just because you can does not mean you should.

SD

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