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Unread 08-12-2011, 11:26 PM   #16
caligiuri87
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1994 ZJ 
 
Join Date: Aug 2011
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i just changed the oil on mine. i have an 94 with 5.2 in it.
has 220000 miles since today yay. never overhauled i believe and very very strong engine. i had kinda same pressure because the prev owner filled it with 5-30.
today i drained and flushed with one quart. then i put in 2 quarts of 10-40 then 1 engine treatment (lucas idea) and then 2 more quarts of 10-40.
i always use valvoline high mileage. and i use baldwin filter. so today did that started up and pressure is little bit higher then 40.
10-30 is what i use on my gf ford escort 4 cyl. so for my k3500 454 i used 10-40. after i did change i let it idle for like 5 or 6 min to get everything oiled up since i let it drain out completely.

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Unread 08-13-2011, 12:06 AM   #17
zander21510
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My dad's old mechanic sometimes ran the wrong oil (cheap bastard...) and the needle would jump all over the place...i put high mileage oil of the stock weight (10w30) and it usually sits right at 40 at idle, a little higher under accel, and a little more higher at highway speed
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Unread 08-13-2011, 09:54 AM   #18
jaguarjoe
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JrMechanic's 100rpm/psi seems pretty true. You don't really need a whole lot of oil pressure to run an engine.

Factory gauges are a joke no matter who's car they're in. Many OEM's use oil pressure switches and a fixed resistor to feed the dummy gauge on the dashboard. It always reads midscale so the typical clueless driver is happy til it reads zero.

Not all oil filters are similar, or at least they didn't used to be. Some had check valve flappers, some didn't. The flapper helps keep oil up in the engine to help with dry starts.
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Unread 08-13-2011, 10:39 AM   #19
ratmonkey
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Quote:
Originally Posted by stormer1092 View Post
it is warmed up my jeep never gets hotter than that. I just did a full service on the coolings system replacing hoses and coolant.
surprised you're not getting a check engine light for the low operating temp.
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Unread 08-13-2011, 12:09 PM   #20
zander21510
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surprised you're not getting a check engine light for the low operating temp.
Mine runs at that temp during the winter...and sometimes in this summer when i only drive it for a little while
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Unread 08-13-2011, 12:19 PM   #21
ratmonkey
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Mine runs at that temp during the winter...and sometimes in this summer when i only drive it for a little while
must be running a 160* stat or it's stuck open.
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Unread 08-13-2011, 01:14 PM   #22
zander21510
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Quote:
Originally Posted by ratmonkey
must be running a 160* stat or it's stuck open.
Well I know its not stuck open because I recently did a radiator flush...and it should be all factory...unless (I wouldn't be surprised) my dad's mechanic put a different one in...

Though living in Texas wouldn't a lower Tstat be better?

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Unread 08-13-2011, 05:01 PM   #23
corndogduff
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I've always thought 180-210 was a good range for a Jeep cooling system. 160 seems awful low.
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Unread 08-13-2011, 10:39 PM   #24
stormer1092
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must be running a 160* stat or it's stuck open.
my jeep has been running that temp since i got it 4 years. Runs fine never throws codes or check engine light?
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Unread 08-13-2011, 11:43 PM   #25
ratmonkey
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It would most likely run a lot better with a 195 in it. You're still operating in open loop mode.
Hows the fuel economy.
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Unread 08-13-2011, 11:47 PM   #26
zander21510
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i get 12-14 city driving 20-23 highway...lately with a even mix of both kinds of driving average 18mpg
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Unread 08-14-2011, 10:36 PM   #27
stormer1092
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It would most likely run a lot better with a 195 in it. You're still operating in open loop mode.
Hows the fuel economy.
What do you mean a 195? Thermostat right? I still get 16.0 mpg average and around 21-22 on the highway.
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