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'75 CJ5 AMC 304 oil? #4606702
12/17/17 10:09 PM
12/17/17 10:09 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 10:13 PM
12/17/17 10:13 PM
Joined: Jun 2017
Posts: 553
DFW
JustN89 Offline
JustN89  Offline
Joined: Jun 2017
Posts: 553
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 10:43 PM
12/17/17 10:43 PM
Joined: Jun 2003
Posts: 33,103
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,103
ME
+2 on the 15w40.

Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606754
12/17/17 11:14 PM
12/17/17 11:14 PM
Joined: Mar 2017
Posts: 5,460
Soviet State of Washington
PimTac Online content
PimTac  Online Content
Joined: Mar 2017
Posts: 5,460
Soviet State of Washington
How’s 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.


2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter

Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606769
12/17/17 11:28 PM
12/17/17 11:28 PM
Joined: Jun 2003
Posts: 17,359
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,359
Deplorable in apple valley, ca
Lets drop a hot 401 in there! The 304 was a slug.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 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 11:29 PM
12/17/17 11:29 PM
Joined: Jun 2003
Posts: 17,359
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,359
Deplorable in apple valley, ca
Originally Posted By: PimTac
How’s 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 durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 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 11:41 PM
12/17/17 11:41 PM
Joined: Mar 2017
Posts: 5,460
Soviet State of Washington
PimTac Online content
PimTac  Online Content
Joined: Mar 2017
Posts: 5,460
Soviet State of Washington
Originally Posted By: Chris142
Originally Posted By: PimTac
How’s 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 didn’t help either. I heard those 392 motors were real gas hogs.


2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter

Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606801
12/17/17 11:55 PM
12/17/17 11:55 PM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
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.


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
Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606802
12/17/17 11:56 PM
12/17/17 11:56 PM
Joined: Jan 2010
Posts: 450
Los Gatos, CA
JeffKeryk Offline
JeffKeryk  Offline
Joined: Jan 2010
Posts: 450
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 11:59 PM
12/17/17 11:59 PM
Joined: May 2015
Posts: 389
AZ
Killer223 Offline
Killer223  Offline
Joined: May 2015
Posts: 389
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
12/18/17 12:05 AM
12/18/17 12:05 AM
Joined: Mar 2017
Posts: 5,460
Soviet State of Washington
PimTac Online content
PimTac  Online Content
Joined: Mar 2017
Posts: 5,460
Soviet State of Washington
I agree with the above. Those motors ran very well on 40wt. I’ll throw a vote out for Delo.


2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter

Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4606867
12/18/17 03:32 AM
12/18/17 03:32 AM
Joined: Dec 2012
Posts: 556
Cave City KY
jakewells Offline
jakewells  Offline
Joined: Dec 2012
Posts: 556
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 03:55 AM
12/18/17 03:55 AM
Joined: Oct 2012
Posts: 307
North Carolina
Egg_Head Offline
Egg_Head  Offline
Joined: Oct 2012
Posts: 307
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)
Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4607016
12/18/17 10:10 AM
12/18/17 10:10 AM
Joined: Oct 2015
Posts: 2,660
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline
Joined: Oct 2015
Posts: 2,660
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.
Re: '75 CJ5 AMC 304 oil? [Re: Jason280] #4607081
12/18/17 11:28 AM
12/18/17 11:28 AM
Joined: Sep 2015
Posts: 981
PENNSYLVANIA
JeepWJ19 Offline
JeepWJ19  Offline
Joined: Sep 2015
Posts: 981
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 :]
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