Recent Topics
Kingquad hard shifting
by jay929
38 minutes 6 seconds ago
CVT transmissions
by Gito
Today at 10:31 AM
sunday newspaper paper price increase $2 to $3
by edwardh1
Today at 10:08 AM
Tomatos and peppers
by Quattro Pete
Today at 10:02 AM
Homemade yogurt + probiotics
by onetwoothreee
Today at 09:16 AM
ATF+4 in a Mercedes Transmission! Really?
by Tikka
Today at 09:12 AM
Porsche 75w90
by dgjks6
Today at 08:51 AM
02' Silverado 5.3L Differential oil (G80 Locker)
by Gito
Today at 08:09 AM
Removing a concrete sidewalk
by Oldtom
Today at 07:35 AM
ATF exchange using the cooler line
by ugabulldog
Today at 07:00 AM
High volume oil pumps?
by dlundblad
Today at 06:49 AM
Penrite LV ATF
by toyota62
Today at 01:30 AM
Valvoline MaxLife Full Synthetic Multi-Vehicle ATF
by glmtd
Today at 12:17 AM
Kendall GT1 euro
by Bullwinkle007
Today at 12:05 AM
$14 5qt. QS 10w-40 syn blend + $5 GC - wallys
by lairdwd
Yesterday at 09:06 PM
Synthetic from dino?
by S2K
Yesterday at 08:35 PM
Voltage fluctuation 2012 Elantra
by schuylkill
Yesterday at 08:28 PM
Tranfer Case 2016 GMC Sierra 1500 6.2 8 speed
by dareo
Yesterday at 07:39 PM
Caliper slide pin questions
by ZZman
Yesterday at 07:24 PM
Perfect Afternoon with F7Fs
by Yah-Tah-Hey
Yesterday at 06:10 PM
Newest Members
joonyflux, dippschtick, Brdftbll, NievesStefanor, Zervun
65529 Registered Users
Who's Online
87 registered (4WD, 10ecfarmer, 2015_PSD, 379KITTY, 69Torino, ag_ghost, 6 invisible), 1705 Guests and 34 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65529 Members
67 Forums
287471 Topics
4795492 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 2 1 2 >
Topic Options
#4635173 - 01/14/18 09:18 PM Jeep 4.7 run with 45% oil capacity for months
HawkeyeScott Offline


Registered: 01/11/07
Posts: 787
Loc: El Oeste
I do some occasional maintenance on an old coworker's 2000 Jeep Grand Cherokee with the 4.7L (141k miles). I planned to change the oil in it today. When I picked it up at his place, I noticed the oil pressure was steady at only 20 psi. I was a little alarmed but limped it the 1.5 miles to my house, maxing it out at 1400 RPM.

Before I pulled the plug, I wanted to see how much oil was in it. It didn't register on the dipstick. Only after I'd added 2.5 qts. did it finally register. I ended up adding about 3.25 qts. and still didn't quite get it to the ADD mark. (This was some used oil I'd drained after a 1000 mile run last year. Caught it in a clean pan and stuck it on the shelf for potential top-off oil.) I started it again and the oil pressure was then normal.

I went ahead and drained it and changed the filter. I didn't notice any obvious signs of major leaks and his driveway is clean, too. The last oil change was about 5500 miles ago, in May 2017, at a Jiffy Lube. When I filled it back up with just under 6 qts. of Chevron Supreme, the oil pressure stayed right where it should be.

As best as I can tell, the Jeep was running with 40-45% of the sump capacity. I opened up the filter and found some metal flakes, though not as many as I expected. The one I picked out and felt had a consistency similar to that of tin foil.

I also figured out his oil warning light on the dash is burned out. That doesn't help, but the oil pressure gauge was still an obvious tell that he and his wife completely missed.

Anyway, I've never been around an engine neglected like this. So I've had a few questions rolling around in my head:

1. My best guess is that the Jiffy Lube didn't get enough oil in there and this family drove the car for 8 months with a low oil level. If Jiffy Lube DID get it filled, what is going on in this engine to burn more than 3 qts. over 5550 miles?
2. Given how little oil there was in the engine, what was the effect on the oil that was in there?
3. Any guesses as to what the flakes in the filter used to be?
4. How much life did they take out of this engine? (I know this can't be answered in specifics.)
5. How close was this thing to seizing?

Top
#4635184 - 01/14/18 09:30 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
Alex_V Offline


Registered: 04/10/16
Posts: 1174
Loc: Campbellsville, KY
I've seen a Dodge 3.9 (Dakota) and Buick LeSabre (3800) run with 1.5 qts. in them, and a Caravan 3.8L run continually, repeatedly with 2 qts. in it. All 3 engines have come out of it seemingly unscathed - not to say it didn't shorten their lifespan, but in all cases that was months or years ago and they only detectable negative effect is continued oil consumption. It may just be using that much - they need to check it periodically. If they're not inclined to do that, they can enjoy the fruits of their labor when it does run dry.
_________________________
I like Chevy and Valvoline.

'13 Cruze, 1.4T, 113K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 169K
'67 Suburban, 350, 331K

Top
#4635216 - 01/14/18 10:27 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
tomcat27 Offline


Registered: 06/25/09
Posts: 3596
Loc: Chicago, IL
our 4.7 used no discernable oil; but I certainly have owned many cars where a quart every 1500-2000 miles was not unusual. (american 4 cylinders)
after my experience last week with a neighbor ( 4 qts low ) it is clear that people do not check their oil level. if you don't know how, stop by once a month and have someone check. I'm pretty sure that Jiffy lube will check it and even top it off for free with the first 3k miles after a change. at least they used to...
_________________________
2015 Rogue, 2014 Sentra, 2001 Camry, 2005 Starcraft, 1998 Dodge B1500
1996 Sebring Jx, 1984 F150, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300

Top
#4635217 - 01/14/18 10:27 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
Bandito440 Online   content


Registered: 02/13/12
Posts: 3855
Loc: NEUS
Thatís a high-mileage 18 year-old engine that wasnít especially great when it was new. It sounds like it hasnít been maintained well either. This is my cynical nature, but that thing is not long for this world. Donít put yourself in a position where youíll get blamed for its failure.
_________________________
'14 Grand Cherokee EcoDiesel
Rotella T6 5w-40 & OEM filter

Top
#4635218 - 01/14/18 10:28 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
It's impossible to say.

Even two exactly the same engine designs can fare differently when run low.

Tell him to check his oil or he'll have a very light wallet (or unexpected and unwelcome debt!)
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

Top
#4635228 - 01/14/18 10:38 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
DemoFly Offline


Registered: 06/03/12
Posts: 994
Loc: Bremerton, WA
Even a 4.7L SOHC V8 can be properly lubricated by ~2 quarts. The gauge on the dash is fake. It reads 20lbs when it has 12v. There's an electronic pressure sender that is an on-off switch (I'm serious). Oil pressure COULD have been only a few PSI lower than spec and that would be due to oil thinning.

Don't overthink it. If it runs good and you could not find any discernable damage in the filter, then there's no discernable damage.


Edited by DemoFly (01/14/18 10:40 PM)
_________________________
Pushrods, please.

Top
#4635231 - 01/14/18 10:45 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
With the 3.7 version, I know of a few people that ran about a quart (of a 5 qt capacity) and shortly ruined their engines. What's the capacity on the WJ? I want to say those were 6 or 7.

It might have just barely survived. I'm guessing it's a leaker, probably the valve cover gaskets, oil pressure sender, front main crank seal. These really aren't known for excessive oil consumption unless they've been abused (maybe this one). If they drive it a lot, it probably never collects enough in one spot to hit the ground. That's how my Liberty is, if it sits a few days I'll get a dime spot on the floor otherwise nothing.
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

Top
#4635247 - 01/14/18 11:10 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
Blkstanger Offline


Registered: 08/13/11
Posts: 1974
Loc: Lakeside, CA
My 4.7 will use about a quart over that many miles. But 4 qts low? I'd guess that they were shorted on the last oil change. Or that engine is already shot. One of the two. And BTW these do have a working pressure gauge. It's not like a Ford.


Edited by Blkstanger (01/14/18 11:13 PM)
_________________________
99 Jeep WJ 4.7 186,000 Maxlife 10w30, Fram Ultra.

Top
#4635260 - 01/14/18 11:30 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
hemitruck Offline


Registered: 03/18/11
Posts: 389
Loc: new jersey
The valve seals need replacing.

Top
#4635261 - 01/14/18 11:31 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
double vanos Offline


Registered: 08/05/04
Posts: 1914
Loc: 5600 feet elevation, Arizona
My SILs 3.8 Jeep was about 4 qts low when I started taking care of it for her. Substituted 0w40 in place of the factory 5w20 recommendation - problem solved.

The guy who owns a lot across the street has an old Camry 5 speed that he parks there to keep people from parking on the lot. Battery went dead so after jumping I had him pull it into my driveway and charged the battery overnight. The next morning I disconnected the charger and just for the heck of it checked the oil. Nothing on the stick. Took 4 qts to get to the stick and a full 5 to full. At least it got Edge 5w30, had a full jug laying around. After adding the oil, he came by, fired her off and drove away. Amazing.
_________________________
Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...

Top
#4635267 - 01/14/18 11:46 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
dishdude Offline


Registered: 11/14/08
Posts: 8834
Loc: Phoenix
You can't drive an 18 year old car and not open the hood for 8 months/5,500 miles.
_________________________
2018 Challenger SRT

Top
#4635269 - 01/14/18 11:49 PM Re: Jeep 4.7 run with 45% oil capacity for months [Re: dishdude]
bbhero Offline


Registered: 03/20/15
Posts: 4746
Loc: Virginia
^^^^^^^^^^^^

Very true indeed. Great point/post Dishdude.
_________________________
Nissan Altima 3.5 Coupe Formula Shell 5w30 Champion 7317
"Treat your family like your friends and treat your friends like your family."

Top
#4635304 - 01/15/18 01:14 AM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
DdDd Offline


Registered: 06/08/17
Posts: 191
Loc: NY
What's gonna happen on an 18year old vehicle worth 3k? Full rebuild?

The owner doesn't care. Top off the fluids and let them drive it into the ground. Somethings going to get it sooner or later

Top
#4635353 - 01/15/18 04:23 AM Re: Jeep 4.7 run with 45% oil capacity for months [Re: HawkeyeScott]
Lubener Offline


Registered: 01/22/11
Posts: 2616
Loc: N.Ohio
The 20 lbs of oil pressure tells the story. Should be atleast twice that while cruising.
_________________________
The "thinking" man's friend.

Top
#4635372 - 01/15/18 05:47 AM Re: Jeep 4.7 run with 45% oil capacity for months [Re: DdDd]
JC1 Offline


Registered: 11/29/08
Posts: 3064
Loc: Oshawa, Ontario Canada
Originally Posted By: DdDd
What's gonna happen on an 18year old vehicle worth 3k? Full rebuild?

The owner doesn't care. Top off the fluids and let them drive it into the ground. Somethings going to get it sooner or later



I agree. You should have just topped it off and let him go on his way. He's too darn lazy to check the oil level in 5000 miles.
_________________________
2015 Grand Caravan SXT Plus 5w-20 PPPP/Fram Ultra Filter
1997 Honda Civic CX 5w-30 Shell Conventional/Fram Ultra Filter

Top
Page 1 of 2 1 2 >