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Unread 06-25-2013, 04:57 PM   #31
nixer600
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People call oils like this snake oil, but why run Mobil one over super tech (Walmart) brand oil, well cause mobile one is better. Since its better is that a snake oil? Is it possible that Lucas mixed in with mobile one is better than straight mobile one ? yes I believe it is better. Does this make them all snake oils?
Its funny to hear mechanics who turn wrenches every day and obviously know things about vehicles shut down Lucas oil as just a gimmick in a Bottle, yet they prefer to run one brand of oil over another. Why do they choose brand A, its because one is better than the other. Lucas can't hurt a jeep, it can only help. It helps lubricate better than oil alone. And that's enough for me.




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Unread 06-25-2013, 05:18 PM   #32
LumpyGrits
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API sets the mininum for engine oil in the USA.....Most companies go way past that like Castrol.
Moble was the first to make syn oil for the aircraft industry.
Oil is the cheapest thing you will EVER put in you 'toys'. Why not buy the best, instead of just the mininum........
LG
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Unread 06-26-2013, 07:04 PM   #33
james04si
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I personally prefer to fix issues as compared to cover them up with a fancy additive. That being said rebuilding or even just replacing the bearings that are the most likely culprit might be out of the question and you just want to prolong the inevitable. My 64 impala burned a quart of strait 50w with a can of STP every 200 miles or so before I could afford to rebuild. Sometimes money is tight.

Before I built up my 258 I had the stock 232 that I'm pretty sure never saw an oil change before I bought it. When I replaced the valve cover there was no metal just a black coating on everything and I had a slight lifter tick. Since it was never my main source of transportation I drove it as is for 10 years and used rotella 15-40w on the oil changes. Before I swapped it out I had no more lifter tick and I could see bare metal under the valve cover again. It did boost the oil pressure, not that I was running low though. Diesel oils have a lot more detergent to clean your insides and the zddp levels are much higher than most regular oils which helps reduce wear on old flat tappet engines like jeeps. Personal experience I would trust it more than any other additives to regular oil.
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Unread 06-27-2013, 06:34 AM   #34
steve1973
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Quote:
Originally Posted by Stegs View Post
do you have the same motor as me? the 258?

maybe thats why my oil pressure is 20 pounds...im running the wrong viscosity

I assumed it was 10w30 like everything else....

*i will note i live in michigan, but the jeep is only driven during the summer months...and I have no owners manual..

reading others forums, i think i should be 15w40 at minimum...
Mine is the original 1973 258 motor. TSM says 13 PSI @ 600 RPM and 37 PSI to 75 PSI @ 1600+ RPM for oil pressure. I am about 45 PSI @ 55 MPH. No tach, so i cant comment on RPM. I run 5W-20 as that is what the owners manual states. I run it in summer and winter.
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Unread 06-27-2013, 06:38 AM   #35
steve1973
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Quote:
Originally Posted by lucdog View Post
I'd be interested in knowing this as well.


Attachment 641208

My 1978 owners manual calls for straight 30w down to a given Temperature, IIRC around 30* , lower than that it was 20w.
To bump up a couple years my '05 TJ calls for 10w-30 with the 4.0L. My '94 4.0L YJ was the same.


I doubt any Recommendation from the OEM on oil Viscosity was ever 5w-20 for a CJ, with a 258 or a 304. The 4cyl. Could be different.

Bill
From the 1973 TSM and owners manual:
LOwest Air temp anticipated Multi-viscosity engine oil
Above 32 10W-30 or 10W-40
Above 0 10W-30 or 10W-40
Below 0 5W-20 or 5W-30
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Unread 06-27-2013, 06:54 AM   #36
swatson454
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IMO, these old things were not built with the tolerances and accuracy that any newer engine is and as such, could use a thicker oil. Not to the point of flowing like syrup out of the fridge but not 0w anything or even 10w anything. I'm all for 15w-40 fleet oil or even 20w-50.

I don't have a favorable opinion about additives either. Again, JMO.


Shawn
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Unread 06-27-2013, 07:13 AM   #37
lucdog
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Quote:
Originally Posted by steve1973

From the 1973 TSM and owners manual:
LOwest Air temp anticipated Multi-viscosity engine oil
Above 32 10W-30 or 10W-40
Above 0 10W-30 or 10W-40
Below 0 5W-20 or 5W-30
I don't even remember seeing a 5w-20 in '73, and I was driving and working on cars then. It was a long time ago though. This was also before the big box chain auto parts stores, with the exception of Western Auto. All my filters and oil came from a locally owned parts store.

I agree Shawn, not a fan.
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Unread 06-27-2013, 08:35 AM   #38
LumpyGrits
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AGAIN---IF you are using the OEM, ele oil pressure gauge.
DON'T TRUST IT TO BE 'RITE'!
The carb'd 258's were a 'loose' eng when built. I have used only 20W-50 Castrol for the last 28+ yrs in mine(I do live in the Mojave Desert).
LG
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Unread 06-27-2013, 08:48 AM   #39
Stegs
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i dont trust it to be accurate, but i do trust it to give me a ballpark idea of oil pressure

Im getting way better oil pressure in it now....My next oil change will be with a diesel oil, with more detergent in it

anybody run that in there newer cherokee's? i might just run it....
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Unread 06-27-2013, 08:56 AM   #40
LumpyGrits
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Half the time that OEM gauge ain't in the b'park.
I've lost count of how many I have seen that were 20+psi off.
Do yourownself a favor, and go to a mech. gauge.
I still use my USA made S/W gauge.
This outfit makes very good stuff.

http://www.marshallinstruments.com/

LG
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Unread 06-27-2013, 08:57 AM   #41
robs7
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Not to hijack this thread but I have a question relating to all of this. Generally speaking, is the oil pressure being sensed before or after the filter? Rob
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Unread 06-27-2013, 08:58 AM   #42
LumpyGrits
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258=after
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Unread 06-27-2013, 09:06 AM   #43
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So how does a better oil filter help boost pressure? More flow? Or does it not actually help at all? Rob
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Unread 06-27-2013, 09:13 AM   #44
swatson454
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Quote:
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So how does a better oil filter help boost pressure? More flow? Or does it not actually help at all? Rob
I was down quite a few pounds and had bottom-end noise after I cheaped out on a Fram filter. Installed a K&N and the issue disappeared.

Now that I think about it, I know damn good and well not to buy one of those wretched things. Oh well...
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Unread 06-27-2013, 09:18 AM   #45
LumpyGrits
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Wix was the OEM oil-filter for the 4's and 6's.
For our Jeeps, NAPA Gold oil-filter is a Wix.
I have only used Wix from day 1. I buy them buy the case from NAPA.
The reason for your "botton-end noise" was the 'lite' oil you used. NOT the Fram filter.
LG
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