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Oil choice for 78 monte carlo #4651880
01/31/18 09:41 AM
01/31/18 09:41 AM
Joined: Nov 2010
Posts: 21
NYC
bigsezza Offline OP
bigsezza  Offline OP
Joined: Nov 2010
Posts: 21
NYC
Hello everyone..I just picked up a 78 monte carlo with a 305 in it. No leaks or burning of oil that I can see. The car has 47k original miles on it and I was wondering which oil to use and if a synthetic or synthetic blend has enough additives in it to be sufficient in that engine. Or should I just stick with a regular dyno oil? Ive read on the forum of people using Mobil 1 with good success. Any help would be very greatly appreciated..Thanks again

Re: Oil choice for 78 monte carlo [Re: bigsezza] #4651881
01/31/18 09:42 AM
01/31/18 09:42 AM
Joined: Apr 2008
Posts: 37,914
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 37,914
Ontario, Canada
A bone stock 305 does not have lofty oil requirements and anything on the shelf now is better than what was available back then. I'd probably run a cheap HDEO in 10w-30.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: Oil choice for 78 monte carlo [Re: bigsezza] #4651889
01/31/18 09:45 AM
01/31/18 09:45 AM
Joined: Dec 2002
Posts: 42,293
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,293
New Jersey
Neat car, put up some pictures!!!

I agree on the HDEO 10w-30.

Re: Oil choice for 78 monte carlo [Re: bigsezza] #4651898
01/31/18 09:52 AM
01/31/18 09:52 AM
Joined: Dec 2008
Posts: 3,116
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline
Joined: Dec 2008
Posts: 3,116
Occupied Virginia
Agreed. Nice car. I sure wish I had my two-door '78 Malibu with the 305 again.

Synthetic would be a waste since a smog-era V8 would not be a good candidate for extended drains. I'd go with a decent high mileage dino, personally.

Re: Oil choice for 78 monte carlo [Re: bigsezza] #4651926
01/31/18 10:06 AM
01/31/18 10:06 AM
Joined: Nov 2010
Posts: 21
NYC
bigsezza Offline OP
bigsezza  Offline OP
Joined: Nov 2010
Posts: 21
NYC
I appreciate the feedback..I was reading different posts of people saying you need an oil with a high zinc content ..Is that applicable for this engine too. I dont know much about the car since I got it last night but I wanted to change the oil and put the right one in

Re: Oil choice for 78 monte carlo [Re: bigsezza] #4651940
01/31/18 10:15 AM
01/31/18 10:15 AM
Joined: Dec 2008
Posts: 3,116
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline
Joined: Dec 2008
Posts: 3,116
Occupied Virginia
That's thing is well broken in so the need for lots of zinc shouldn't be an issue. That said, it couldn't hurt either.

Re: Oil choice for 78 monte carlo [Re: bigsezza] #4651941
01/31/18 10:15 AM
01/31/18 10:15 AM
Joined: Mar 2013
Posts: 5,027
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,027
The Midwest
If u recall correctly, those engines were known to wear the cam out because it wasn't flame hardened. It is a very cheap engine to rebuild and make faster.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: Oil choice for 78 monte carlo [Re: bigsezza] #4651946
01/31/18 10:25 AM
01/31/18 10:25 AM
Joined: Oct 2012
Posts: 2,319
Northern Ontario, Canada
Danno Online content
Danno  Online Content
Joined: Oct 2012
Posts: 2,319
Northern Ontario, Canada
If it was my car, I would use Pennzoil Yellow Bottle, 10W-30.


2016 Sorento SX V6 AWD
2015 KIA RIO SX
2010 Mazda 3 2.0L
2009 Venza V6 AWD
2013 Sonata 2.4L RIP in write-off crash
Re: Oil choice for 78 monte carlo [Re: bigsezza] #4651971
01/31/18 11:06 AM
01/31/18 11:06 AM
Joined: Apr 2015
Posts: 287
Georgia
Charlie2015 Offline
Charlie2015  Offline
Joined: Apr 2015
Posts: 287
Georgia
Valvoline 5w30


1998 Honda Accord EX 2.3L Auto (Sold) 214k mi
2009 Scion tC Manual (Daily Driver) 165k mi
Re: Oil choice for 78 monte carlo [Re: bigsezza] #4651977
01/31/18 11:16 AM
01/31/18 11:16 AM
Joined: Apr 2017
Posts: 1,415
San Rafael, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 1,415
San Rafael, CA
my 92 chevy 1500 with the flat tappet cam 305 got better fuel economy and the engine was much quieter when i started running royal purple hps 5w-30. i'd recommend that.


2010 Ford Escape 2.5~91K Miles: AMSOIL SS 5W-30, AMSOIL SS FE ATF.
1995 Chevy Silverado 5.7 ~276K Miles: Delo 10W-30, AMSOIL OE MV ATF.
AMSOIL
Re: Oil choice for 78 monte carlo [Re: Danno] #4652051
01/31/18 12:24 PM
01/31/18 12:24 PM
Joined: Aug 2008
Posts: 2,181
Cali
Malo83 Offline
Malo83  Offline
Joined: Aug 2008
Posts: 2,181
Cali
Originally Posted By: Danno
If it was my car, I would use Pennzoil Yellow Bottle, 10W-30.

That's what i use in my 83 305 with 230K original miles although for the longest time i ran straight 30 weight Pennzoil.

Re: Oil choice for 78 monte carlo [Re: Danno] #4652089
01/31/18 01:08 PM
01/31/18 01:08 PM
Joined: Dec 2006
Posts: 19,106
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline
Joined: Dec 2006
Posts: 19,106
Dallas,Tx USA
Originally Posted By: Danno
If it was my car, I would use Pennzoil Yellow Bottle, 10W-30.


^^This


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 5W20

Re: Oil choice for 78 monte carlo [Re: bigsezza] #4652113
01/31/18 01:31 PM
01/31/18 01:31 PM
Joined: Oct 2015
Posts: 2,796
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline
Joined: Oct 2015
Posts: 2,796
Balearic Islands , Spain
Shell Rotella 10W-30.


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: Oil choice for 78 monte carlo [Re: bigsezza] #4652168
01/31/18 02:29 PM
01/31/18 02:29 PM
Joined: Oct 2004
Posts: 8,300
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 8,300
Cincinnati, OH, USA
The 305s I had were hard on cams & valve seals-I would add a vote for Maxlife, in 10W30 or whatever weight gives you good oil pressure (at 47K it shouldn't matter). I miss my old '78 Monte, had T-tops & a 305, totalled in a snowstorm by an idiot with no insurance (not me).


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Oil choice for 78 monte carlo [Re: bigsezza] #4652181
01/31/18 02:40 PM
01/31/18 02:40 PM
Joined: Nov 2010
Posts: 21
NYC
bigsezza Offline OP
bigsezza  Offline OP
Joined: Nov 2010
Posts: 21
NYC
[censored] that sucks he didnt have insurance. I will put up some pics of the car as soon as I can and I apprecaite all the feedback..I will go with PYB or even a maxlife and just do regular interval changes

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