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Best oil weight for 1977 Chevy Monte Carlo 305 #2932316 03/08/13 07:47 AM
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jhammer382 Offline OP
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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 07:47 AM.
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932319 03/08/13 07:52 AM
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Falcon_LS Offline
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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 08:13 AM
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Bottom_Feeder Offline
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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 08:14 AM
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mrsilv04 Offline
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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 08:16 AM
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FL_Rob Offline
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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 08:18 AM.
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932336 03/08/13 08:17 AM
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dave1251 Offline
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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 08:18 AM
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dave1251 Offline
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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 09:16 AM
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racer12306 Offline
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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 09:28 AM
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Bandito440 Offline
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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 09:56 AM
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Nickdfresh Offline
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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 10:31 AM
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Oldswagon Offline
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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 11:31 AM
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electrolover Offline
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A high mileage 10/30 or rotella T5 10/30 would be just fine. No need for 20/50!

Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2932524 03/08/13 11:39 AM
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umungus1122 Offline
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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
'04 Crown Vic 95k Maxlife full syn 5w-20
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: dave1251] #2932531 03/08/13 11:51 AM
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Clevy Offline
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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 11:55 AM
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maybehabitformin Offline
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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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