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Unread 09-01-2013, 07:45 PM   #1
Leatherneck0311
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oil capacity. 4.2 not reading on dipstick

ok, please i feel so dumb, but ya'll bare with me.

i threw in some rotella 15w40 in my 4.2liter. i added 6 quarts to include pre-filling the filter. ran the motor for a little, let her cool down. i went to check the oil level and for some reason its barely reading, it's at the end of the stick on the tip below add oil mark.

i have read people debating, 5 or 6 qts. what should i do in this case? i dont want to over fill her and cause over pressure and blow more seals(has rear main leaking slow)

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Unread 09-01-2013, 08:10 PM   #2
Michaelgoesrawr
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My 4.2 only take a five quart oil change jug.
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Unread 09-01-2013, 08:15 PM   #3
jokerchief462
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This question came up in another forum turned out the dipstick was wrong length.

Sent from underneath my Jeep
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Unread 09-01-2013, 08:18 PM   #4
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include further vehicle info

typically a 4.2 takes 5.3 quarts, if your dipstick ain't showing oil after 6 quarts, you probably got the wrong pan or dipstick in it.


ps. y'all spelt ya'll wrong
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Unread 09-01-2013, 08:18 PM   #5
Leatherneck0311
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yeah but it's not reading oil levels on the dip stick. like its reading on the tip but not on the add oil-------------full lines. almost gives me the impression that i have a larger oil pan. i have no idea.
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Unread 09-01-2013, 08:19 PM   #6
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i mentioned 4.2 liter 258 amc. its for a 1990 yj
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Unread 09-01-2013, 08:29 PM   #7
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for that vehicle it takes 6.0 quarts.

some take 5 some take 6, thats why we would like to know vehicle specs

you probably have to add around .2 or .3 quarts cuz of the filter. try that and see if the dipstick evens out. also check oil pressure after to make sure nothings going wrong

btw, you shouldnt have put 15w-40 in it, thats heavy oil..
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Unread 09-01-2013, 08:42 PM   #8
Leatherneck0311
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Originally Posted by Jeep_Fanatic View Post
for that vehicle it takes 6.0 quarts.

some take 5 some take 6, thats why we would like to know vehicle specs

you probably have to add around .2 or .3 quarts cuz of the filter. try that and see if the dipstick evens out. also check oil pressure after to make sure nothings going wrong

btw, you shouldnt have put 15w-40 in it, thats heavy oil..

diesel oil is perfectly fine for the old amc motors which are tappet motors. they need the extra protection from wear. i am in florida so, its hot as hell down here. there are countless of threads on running 15w40 on 258 motors. it is a great move.
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Unread 09-01-2013, 08:49 PM   #9
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Quote:
Originally Posted by Leatherneck0311 View Post
diesel oil is perfectly fine for the old amc motors which are tappet motors. they need the extra protection from wear. i am in florida so, its hot as hell down here. there are countless of threads on running 15w40 on 258 motors. it is a great move.
yea 15w-40 in the summer 10w-40 in the winter

these old school flat tappet engines with heavy miles and long strokes need the thick stuff, 30 weight oil ain't gonna fly once you pass the 100k miles mark
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Unread 09-01-2013, 08:57 PM   #10
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each is his own! I stick to regular oil haha, guess working in a tire/oil shop has taken its toll on me...
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Unread 09-01-2013, 09:18 PM   #11
Michaelgoesrawr
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Quote:
Originally Posted by Xzero117

yea 15w-40 in the summer 10w-40 in the winter

these old school flat tappet engines with heavy miles and long strokes need the thick stuff, 30 weight oil ain't gonna fly once you pass the 100k miles mark
Uh oh. I've been running 10-30 in mine. It only has about 30k on a rebuilt motor though. Good to know though.
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Unread 09-01-2013, 10:07 PM   #12
Tom95YJ
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Both my XJ (4.0) and YJ (4.2) take 6 Quarts
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Unread 09-02-2013, 09:58 PM   #13
greyarea
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My old 4.2 took almost 7qts with a full quart oil filter in place of the original so if you a are running a stock filter 6.5qts +/- should be close to full.
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Unread 09-03-2013, 01:19 AM   #14
Dingo1033
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My first thought was an incorrect dipstick. Happened to me on a car a bought from an auction. Can anybody measure their dipstick (insert joke here) and post the measurement.
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Unread 09-03-2013, 09:36 AM   #15
fishadventure
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Quote:
Originally Posted by Michaelgoesrawr View Post
Uh oh. I've been running 10-30 in mine. It only has about 30k on a rebuilt motor though. Good to know though.
No "uh-oh" to worry about. The "heavier" the oil the less lubricity it has. 10-30 is fine and will be for a very long time in your motor- although if you are in a hot climate 10-40 might be called for. IMHO
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