Recent Topics
2015 Odyssey - Which synthetic ATF?
by AngryScientist. 12/14/18 07:56 PM
suprise
by ernied. 12/14/18 07:33 PM
2016 Traverse 6350mi Schaeffers 9000 5W30
by chevman4life. 12/14/18 07:21 PM
Oil filter for Canadian winter
by Popsy. 12/14/18 06:11 PM
12-14-18 only! Irwin vise @ Menards. $99.99
by Kruse. 12/14/18 06:01 PM
10" Subwoofer - $6.52 Each
by Greg L. 12/14/18 05:31 PM
Finding 507.00 spec oil
by sloinker. 12/14/18 05:31 PM
New Tires for the Old Chevy!
by dogememe. 12/14/18 05:09 PM
Back to Basics II
by MolaKule. 12/14/18 04:31 PM
"SG(+)" 15w40 or better oil 1987 BBC 454
by F239141. 12/14/18 03:52 PM
All Mazda 3’s have bad OCV’s?
by buster. 12/14/18 03:44 PM
Bad cylinder 3 misfire.
by Hemispheres. 12/14/18 02:49 PM
Small leak at toilet base - bad wax ring?
by Oro_O. 12/14/18 02:38 PM
Ok I take it back about Keurig
by StevieC. 12/14/18 02:29 PM
Edge 5W-30 7.9k miles '13 F150 5.0
by dustyroads. 12/14/18 02:11 PM
Stick with WSS-M2C946-A?
by BlueFog. 12/14/18 01:42 PM
How engine capacity affects fuel consumption?
by NICAT. 12/14/18 01:12 PM
Newest Members
wsalopek, jcr1293, maxwellk, BlueFog, Frank_G35
66682 Registered Users
Who's Online Now
85 registered members (aquariuscsm, AngryScientist, 69GTX, 86lxjunker, 10ecfarmer, 9 invisible), 1,664 guests, and 51 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics295,083
Posts4,927,439
Members66,682
Most Online2,553
Oct 27th, 2018
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
Page 1 of 2 1 2
'75 CJ5 AMC 304 oil? #4606702
12/17/17 09:09 PM
12/17/17 09:09 PM
Joined: Jun 2007
Posts: 64
GA
Jason280 Offline OP
Jason280  Offline OP
Joined: Jun 2007
Posts: 64
GA
Recently picked up a '75 Jeep CJ5 with an AMC 304 V8. This is my first AMC engine, and first V8 in a Jeep. Speedometer has been changed out to a newer model, so I have no idea the mileage. Any suggestions on an engine oil and weight?

Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606705
12/17/17 09:13 PM
12/17/17 09:13 PM
Joined: Jun 2017
Posts: 619
DFW
JustN89 Offline
JustN89  Offline
Joined: Jun 2017
Posts: 619
DFW
Rotella T 15W-40 would be my recommendation. It has earned high praise from folks familiar with those old AMC motors.

Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606731
12/17/17 09:43 PM
12/17/17 09:43 PM
Joined: Jun 2003
Posts: 33,568
ME
eljefino Online content
eljefino  Online Content
Joined: Jun 2003
Posts: 33,568
ME
+2 on the 15w40.

Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606754
12/17/17 10:14 PM
12/17/17 10:14 PM
Joined: Mar 2017
Posts: 6,516
...
PimTac Offline
PimTac  Offline
Joined: Mar 2017
Posts: 6,516
...
Hows the gas mileage on that 304? I had a IH Scout with the 304. The two are different engines but get confused for each other.

I got 10mpg on a good day.


Cannot see signatures any longer so it doesn’t matter.
Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606769
12/17/17 10:28 PM
12/17/17 10:28 PM
Joined: Jun 2003
Posts: 17,818
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,818
Deplorable in apple valley, ca
Lets drop a hot 401 in there! The 304 was a slug.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: '75 CJ5 AMC 304 oil? [Re: PimTac] #4606770
12/17/17 10:29 PM
12/17/17 10:29 PM
Joined: Jun 2003
Posts: 17,818
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,818
Deplorable in apple valley, ca
Originally Posted By: PimTac
Hows the gas mileage on that 304? I had a IH Scout with the 304. The two are different engines but get confused for each other.

I got 10mpg on a good day.
the 345 in my scout got 11mpg. The 392 in my 1210 got 5.5


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: '75 CJ5 AMC 304 oil? [Re: Chris142] #4606784
12/17/17 10:41 PM
12/17/17 10:41 PM
Joined: Mar 2017
Posts: 6,516
...
PimTac Offline
PimTac  Offline
Joined: Mar 2017
Posts: 6,516
...
Originally Posted By: Chris142
Originally Posted By: PimTac
Hows the gas mileage on that 304? I had a IH Scout with the 304. The two are different engines but get confused for each other.

I got 10mpg on a good day.
the 345 in my scout got 11mpg. The 392 in my 1210 got 5.5




My Scout was a 1979 model year. That engine had the old air pump and all sorts of junk to help with air pollution. The horrible Holley carb they used then didnt help either. I heard those 392 motors were real gas hogs.


Cannot see signatures any longer so it doesn’t matter.
Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606801
12/17/17 10:55 PM
12/17/17 10:55 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
15w40 isn't a bad suggestion in warmer climates. I restored a '79 CJ7 with a 304 in it earlier this year - didn't rebuild the engine, just new seals and gaskets, and put Schaeffer's 7000 10w30 in it and it ran very well with it. A syn blend 10w30/40 would be my choice - Valvoline Maxlife, Rotella T5, Schaeffer's, or other.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606802
12/17/17 10:56 PM
12/17/17 10:56 PM
Joined: Jan 2010
Posts: 718
Los Gatos, CA
JeffKeryk Offline
JeffKeryk  Offline
Joined: Jan 2010
Posts: 718
Los Gatos, CA
I used to help with a 304 Gremlin. Real happy with 10w30 Dino back in the day. I would run a compression check and pull a valve cover to inspect the inner valve cover, etc. I like MaxLife. Rotella 15w40 seems to do well in the flat tappet motors...

Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606805
12/17/17 10:59 PM
12/17/17 10:59 PM
Joined: May 2015
Posts: 394
AZ
Killer223 Offline
Killer223  Offline
Joined: May 2015
Posts: 394
AZ
i ran Valvoline 10/40 motorcycle oil in mine.


08 6.7 cummins G56
04 5.9 cummins
11 ranger 4.0
16 KTM 250 XC
Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606811
12/17/17 11:05 PM
12/17/17 11:05 PM
Joined: Mar 2017
Posts: 6,516
...
PimTac Offline
PimTac  Offline
Joined: Mar 2017
Posts: 6,516
...
I agree with the above. Those motors ran very well on 40wt. Ill throw a vote out for Delo.


Cannot see signatures any longer so it doesn’t matter.
Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606867
12/18/17 02:32 AM
12/18/17 02:32 AM
Joined: Dec 2012
Posts: 562
Cave City KY
jakewells Offline
jakewells  Offline
Joined: Dec 2012
Posts: 562
Cave City KY
10w30 or 10w40 PYB would be my choice.


1994 Ford F150 302 4R70
Chevron Delo SAE 30 CF/SL Fram XG8A

1978 Chevy Nova 250 I6 Borg Warner T5
Rotella 10W40 Fram XG5

Re: '75 CJ5 AMC 304 oil? [Re: jakewells] #4606870
12/18/17 02:55 AM
12/18/17 02:55 AM
Joined: Oct 2012
Posts: 339
North Carolina
Egg_Head Offline
Egg_Head  Offline
Joined: Oct 2012
Posts: 339
North Carolina
My 1979 CJ-7 w/304 gets 13 mpg on the highway. It's stock w/31" tires. I use Peak 10-30, Smitty's 5-30 or whatever is laying around. It does not seem to care.


1979 Garelli Rally Sport
2009 Cub Cadet LT1042
2002 BMW 540 M Sport (totaled)
2011 MB E350 4Matic wagon
1979 CJ-7
Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4607016
12/18/17 09:10 AM
12/18/17 09:10 AM
Joined: Oct 2015
Posts: 2,802
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline
Joined: Oct 2015
Posts: 2,802
Balearic Islands , Spain
Shell Rotella T4 15W-40, old flat tappet overhead valve cast iron lumps love a good HDEO.


1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.

Finnish expat in Spain.
Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4607081
12/18/17 10:28 AM
12/18/17 10:28 AM
Joined: Sep 2015
Posts: 994
PENNSYLVANIA
JeepWJ19 Offline
JeepWJ19  Offline
Joined: Sep 2015
Posts: 994
PENNSYLVANIA
So many good suggestions!

I'd try M1 HM 10W40.


2002 Jeep WJ 4.0 | Mobil 1 HM 5w30 |
TG8A | 2.5" lift | 148k miles

Software Engineer :]
Page 1 of 2 1 2

BOB IS THE OIL GUY® Powered by UBB.threads™