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Best oil weight for 1977 Chevy Monte Carlo 305 #2932316
03/08/13 08:47 AM
03/08/13 08:47 AM
Joined: May 2011
Posts: 3
NJ
jhammer382 Offline OP
jhammer382  Offline OP

Joined: May 2011
Posts: 3
NJ
Hey Everyone,

Trying to get some insight on the best weight oil for my car. Its a 1977 Chevy Monte Carlo with the 5.0/305 2bbl carbuerator with 66,000 original miles. It is the original engine that was supposedly freshened about 15,000 miles ago, but not sure exactly what was done to it. I have a feeling its just new seals. Completely stock minus headers.

The car does not appear to leak or burn any oil. It does sit in a garage for periods of time as its not a daily driver. I was thinking a 10w-40 or 20w-50. I run 20w-50 in my other vehicle which has an older Chevy 350 that has worn valve seals and does burn a tad of oil. It likes it, but feel that may be too heavy for the 305.

What do you all think? And this is non-synthetic oil.

Thanks for the help in advance!

Last edited by jhammer382; 03/08/13 08:47 AM.
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932319
03/08/13 08:52 AM
03/08/13 08:52 AM
Joined: Oct 2008
Posts: 4,241
Kuwait
Falcon_LS Offline
Falcon_LS  Offline

Joined: Oct 2008
Posts: 4,241
Kuwait
Maybe consider a 5W-40 like Rotella T6?


Petro-Canada Duron HP 15W-40 CK-4/SN
99 Explorer: H17W02
00 Pajero: XG9688
01 Grand Marquis: XG2
05 Envoy: XG9837

Motorcraft 5W-50:
18 Mustang GT: XG10575
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932332
03/08/13 09:13 AM
03/08/13 09:13 AM
Joined: Dec 2008
Posts: 3,237
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline

Joined: Dec 2008
Posts: 3,237
Occupied Virginia
It doesn't need anything other than the 10w40 the manual calls for. 20w50 is too heavy for a non-DD in Jersey's climate. Hopefully whoever rebuilt it replaced the soft factory cam.

T6 may not be a bad choice at all.

Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932333
03/08/13 09:14 AM
03/08/13 09:14 AM
Joined: Dec 2006
Posts: 8,537
Illinois
mrsilv04 Offline
mrsilv04  Offline

Joined: Dec 2006
Posts: 8,537
Illinois
10w-30 Rotella or 10w-30 Rotella T5 synthetic blend.


2004 Silverado - on its 3rd Jasper engine in less than one year.
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932335
03/08/13 09:16 AM
03/08/13 09:16 AM
Joined: Jun 2009
Posts: 1,509
gulf coast FL.U.S.
FL_Rob Offline
FL_Rob  Offline

Joined: Jun 2009
Posts: 1,509
gulf coast FL.U.S.
I'd go for a heavy duty 30 ,such as Rotella T5 10w30. With low miles and what sounds like a non-leaker, you can go with a nice Mobil 1 in 0w40 flavor.The ZDDP is what you're after with this engine,not just a thicker grade.

Edit:beat me to it mrsilv04

Last edited by FL_Rob; 03/08/13 09:18 AM.
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932336
03/08/13 09:17 AM
03/08/13 09:17 AM
Joined: Jul 2005
Posts: 11,775
Maricopa Arizona
dave1251 Offline
dave1251  Offline

Joined: Jul 2005
Posts: 11,775
Maricopa Arizona
5W-30.


make the inside of your engine oil cap white.
don't use.
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: FL_Rob] #2932338
03/08/13 09:18 AM
03/08/13 09:18 AM
Joined: Jul 2005
Posts: 11,775
Maricopa Arizona
dave1251 Offline
dave1251  Offline

Joined: Jul 2005
Posts: 11,775
Maricopa Arizona
Originally Posted By: FL_Rob
I'd go for a heavy duty 30 ,such as Rotella T5 10w30. With low miles and what sounds like a non-leaker, you can go with a nice Mobil 1 in 0w40 flavor.The ZDDP is what you're after with this engine,not just a thicker grade.


Nope. Myth's never die on the internets.


make the inside of your engine oil cap white.
don't use.
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932397
03/08/13 10:16 AM
03/08/13 10:16 AM
Joined: Oct 2005
Posts: 2,324
Baltimore, MD
racer12306 Offline
racer12306  Offline

Joined: Oct 2005
Posts: 2,324
Baltimore, MD
I had an 85 Monte SS with the L69 and it ran just fine on normal 10w30. Good oil pressure, no burnoff.


16 Ford Focus/2.0/6A
04 Dodge Neon SXT/2.0/MTX
17 Chrysler Pacifica/3.6/9A
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: Falcon_LS] #2932414
03/08/13 10:28 AM
03/08/13 10:28 AM
Joined: Feb 2012
Posts: 3,870
NEUS
Bandito440 Offline
Bandito440  Offline

Joined: Feb 2012
Posts: 3,870
NEUS
Originally Posted By: Falcon_LS
Maybe consider a 5W-40 like Rotella T6?

That's what I would use. Great stuff.


'14 Grand Cherokee EcoDiesel
Rotella T6 5w-40 & OEM filter
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932441
03/08/13 10:56 AM
03/08/13 10:56 AM
Joined: Mar 2006
Posts: 6,156
Buffalo, NY
Nickdfresh Offline
Nickdfresh  Offline

Joined: Mar 2006
Posts: 6,156
Buffalo, NY
I'd just use Quaker State Defy 10W-30 or 10W-40, or maybe MaxLife 10W-40...

Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932474
03/08/13 11:31 AM
03/08/13 11:31 AM
Joined: Jan 2003
Posts: 793
ON, Canada
Oldswagon Offline
Oldswagon  Offline

Joined: Jan 2003
Posts: 793
ON, Canada
My brother has a 1976 350-2bbl Chevy, basically stock. We've run 10W30 HD oil in it for years with good success.

Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932515
03/08/13 12:31 PM
03/08/13 12:31 PM
Joined: Dec 2010
Posts: 3,192
TEXAS
electrolover Offline
electrolover  Offline

Joined: Dec 2010
Posts: 3,192
TEXAS
A high mileage 10/30 or rotella T5 10/30 would be just fine. No need for 20/50!


2004 F150 5.4 160k-Castrol TXT 5/40, Distance+ 3410-KREEN
2004 Explorer 4.0 130k-PU 5w30, Distance+ 3410
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932524
03/08/13 12:39 PM
03/08/13 12:39 PM
Joined: Feb 2008
Posts: 1,203
PA
umungus1122 Offline
umungus1122  Offline

Joined: Feb 2008
Posts: 1,203
PA
Any 5w-30 will do. HM if you're worried about it leaking.


'95 Chevy 1/2t 305 208k -NexGen Maxlife 5w-30, Wix filter
'89 Jeep Comanche 4.0 5spd 285k - GC 0w-30, Bosch LongLife filter
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: dave1251] #2932531
03/08/13 12:51 PM
03/08/13 12:51 PM
Joined: Nov 2010
Posts: 9,783
Saskatoon canada
Clevy Offline
Clevy  Offline

Joined: Nov 2010
Posts: 9,783
Saskatoon canada
Originally Posted By: dave1251
Originally Posted By: FL_Rob
I'd go for a heavy duty 30 ,such as Rotella T5 10w30. With low miles and what sounds like a non-leaker, you can go with a nice Mobil 1 in 0w40 flavor.The ZDDP is what you're after with this engine,not just a thicker grade.


Nope. Myth's never die on the internets.

Ha. No kidding. 1100 posts and you'd think he woulda absorbed something.


2006 Charger RT
Miles x 2 per oil filter
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: Clevy] #2932538
03/08/13 12:55 PM
03/08/13 12:55 PM
Joined: Feb 2013
Posts: 101
Mi
maybehabitformin Offline
maybehabitformin  Offline

Joined: Feb 2013
Posts: 101
Mi
Any 5w30 you have less start up wear and the same thickness on the top end its a no brainer to me. I would use Defy myself It has higher zinc.

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