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#2282789 - 06/08/11 05:59 PM 1970 Monte Carlo oil recommendation
wtd Offline


Registered: 06/25/02
Posts: 1744
Loc: southwest Mo.
I have a 70 Monte Carlo with a 396 big block in it. I've been reading about how the newer SM and SN oils don't have enough Zinc in them to protect the cam on a flat tappet engine. This engine is pretty much stock except for it being bored out .60 Cam is stock.

I'm currently running 10W-40 Havoline conventional in it. I've tried a 10W-30 in it but the engine doesn't seem to like it and oil pressure is not where I want it. Engine probably only has 15,000 miles on the rebuild.

So what oil should I run in this engine? No synthetic recommendations please. I also want to stick to a 40 weight.

Are there any additives that you would recommend instead that can be added to the oil to add some Zinc back into it.? Thanks for any information.

Wayne
_________________________
2014 Mustang GT
1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo

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#2282800 - 06/08/11 06:08 PM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 10513
Loc: N.H, U.S.A.
Rotella T6 or T5. Also MTD or John Deere lawn tractor oil is formulated with high addp. Also 4T Conventional Motorcycle oil is high zddp and is probably the most cost effective. The Motorcycle picture on the bottle doesnt mean anythig the oil typ meets API-SH/SJ automotive standards. You cam is broken in and doesnt need killer amts of zddp - a moly additive migh be beneficial.


Edited by ARCOgraphite (06/08/11 06:09 PM)
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#2282816 - 06/08/11 06:31 PM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
Robenstein Offline


Registered: 12/23/09
Posts: 5419
Loc: Central IA
Run any of the big three diesel oils (Chevron Delo, Rotella T, or Mobil Delvac). You can always buy some break in additive as offered by Redline, Comp Cams, or Lucas as well.

If you want another route, you can use Brad Penn Oil or Valvoline VR1 oils. Kendall GT1 in 20w50 is the only Kendall GT1 with boosted levels of zinc so you can use that one as well. Kendall GT1 locally here is about 3 bucks to 3.50 a quart. Between Kendall and Valvoline VR1 you should be able to get one or both at most parts stores easily.
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2011 Triumph Speedmaster
1986 Chevy Monte Carlo SS
1970 Chevy Nova
2006 Scion TC

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#2282820 - 06/08/11 06:34 PM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
Robenstein Offline


Registered: 12/23/09
Posts: 5419
Loc: Central IA
And honestly, I would dump that current fill ASAP. Big Block Chevy motors have a 1:7 ratio and I would not trust an oil with low levels of ZDDP in them in any BBC engine, let alone a pre smogger era one. It would have to be loaded with moly or titanium, and even then I would be leery. My cousin has a 427 powered 67 Chevelle and his has a stock cam. No problems and he beats the tar out of that thing.



Edited by Robenstein (06/08/11 06:35 PM)
_________________________
2011 Triumph Speedmaster
1986 Chevy Monte Carlo SS
1970 Chevy Nova
2006 Scion TC

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#2282870 - 06/08/11 07:38 PM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
JRed Offline


Registered: 06/01/09
Posts: 1691
Loc: Virginia
Buy some oil meant for diesel engines - Rotella, Delvac, Delo, etc. They'll all do you well. 15w-40 would probably be fine as a summer fill for you; many of those same oils come in 10w-30 as well.

Or you could just use Rotella T6 year round if you're willing to spend a little more.
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06 Subaru Impreza WRX - Sold. The only mechanical thing I'll ever love.
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#2282874 - 06/08/11 07:42 PM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
15w-40 HDEO oil would be a good starting point for an oil.
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Why do people post I want the best for my car,,, When there isn't anything that is the best on the car to begin with.

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#2282935 - 06/08/11 09:09 PM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
Trvlr500 Offline


Registered: 11/03/08
Posts: 508
Loc: UT
For your car I'd say that you should at least go with a 15-40 diesel oil. I've got a '73 Caddy and after ten years of running nothing but Mobil 1 15-50 I played around the Valvoline VR-1 and Pennzoil but I'm now running Rotella T6 5-40.

I know you said you didn't want to run a synthetic but have to say. There is absolutely NOTHING as good as Mobil 1 15-50 for an old V-8 short of the "boutique" oils if you live in the right climate and you do. It's got plenty of ZDDP. The only reason I don't use it anymore is because of the frigid temps where I live.

If you really want to stick with dino then the diesel oils or a boutique oil are your only option. You could get away with a 15-40 year around where you live as long as you don't drive the car all the time when it gets down below 30 and/or make sure you warm it up before you drive off.

Even at that, I know a guy that lives in Canada of all places and uses nothing but 15-40 diesel oil in ALL of his cars and they are NOT garaged. He's a mechanic and has never had a problem.


Edited by Trvlr500 (06/08/11 09:11 PM)

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#2282941 - 06/08/11 09:14 PM Re: 1970 Monte Carlo oil recommendation [Re: Robenstein]
Trvlr500 Offline


Registered: 11/03/08
Posts: 508
Loc: UT
Originally Posted By: Robenstein
And honestly, I would dump that current fill ASAP. Big Block Chevy motors have a 1:7 ratio and I would not trust an oil with low levels of ZDDP in them in any BBC engine, let alone a pre smogger era one. It would have to be loaded with moly or titanium, and even then I would be leery. My cousin has a 427 powered 67 Chevelle and his has a stock cam. No problems and he beats the tar out of that thing.



+1 on getting that garbage out of the engine ASAP.

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#2282979 - 06/08/11 09:48 PM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
wtd Offline


Registered: 06/25/02
Posts: 1744
Loc: southwest Mo.
Well, luckily I've only driven the car about 500 miles in the last 2 1/2 years so not much damage should have been done. I will probably try a 15W-40 diesel oil because I don't drive it all of the time but want to start driving it more than I do. What about a 5W-40 diesel oil?

Thanks for the ideas. I plan on changing it tomorrow.

Wayne
_________________________
2014 Mustang GT
1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo

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#2282987 - 06/08/11 09:57 PM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
ArtDart Offline


Registered: 07/25/09
Posts: 351
Loc: Missouri
Delo 15w40
nice oil

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#2283205 - 06/09/11 07:57 AM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
addyguy Offline


Registered: 09/08/05
Posts: 14026
Loc: Canada
Like others have said, any 15W-40 HDEO you can get easily, and at a good price, will be perfect.

Nice car!
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Castrol GTX 5W-30; MPH 9688 filter.

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#2283401 - 06/09/11 11:21 AM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
Robenstein Offline


Registered: 12/23/09
Posts: 5419
Loc: Central IA
You can get a really good deal on diesel if you buy it in the 5 gallon buckets. Look up a Chevron, Shell, or Mobil oil distributor in your area. Sometimes you can get a good deal from them. Or any of your farm stores will usually have a good selection.

I know I can buy Mobil Delvac 1300 for 52 bucks for a 5 gallon jug at my local farm store, or 2 gallon jugs of Mystik Syn Blend in 10w30, 10w40, 15w40, or 15w50 for 21 bucks.
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2011 Triumph Speedmaster
1986 Chevy Monte Carlo SS
1970 Chevy Nova
2006 Scion TC

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#2283431 - 06/09/11 11:47 AM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 10513
Loc: N.H, U.S.A.
You'll loose power with the cheap 15w-40 diesel oil and you dont want or need the soot dispersant. The Havoline was fine if not ultimate - good moly content. I would still highly recommend 4T motorcycle oil. If you are afraid of buying buike oil then you bettrer leave BITOG and go back to Lubricant's 101 to revisit the motor oil primer. You guys are off base recommending diesel oil over superbike motorcycle oil or Lawen tractor oil. Very silly boys. Ive built a few nice torquey 402 and 427 in the '70's - not that 454 externally balanced junk smile
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2014 Nissan Rogue S CVT, OC#4 24210mi-Castrol Magnetec 5W30+ Fram Toughguard Filter 7317
2015 Forester 6MT 5Door, OC#7 50318mi-PEAK 0W20+Subaru Filter

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#2283442 - 06/09/11 11:59 AM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
wtd Offline


Registered: 06/25/02
Posts: 1744
Loc: southwest Mo.
From every thing I've been reading, the diesel oils have had the zinc lowered in them as well. What I've decided to do in the meantime since I can't seem to find any of the specialty oils locally, is go with Valvoline 10W-40 and add Lucas Zinc-Plus to the oil. That should be good in the meantime.

Wayne
_________________________
2014 Mustang GT
1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo

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#2283917 - 06/09/11 06:16 PM Re: 1970 Monte Carlo oil recommendation [Re: wtd]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 10513
Loc: N.H, U.S.A.
I didnt know lucas was selling that stuff OTC. Not that I would want to support Lucas ... Whats the PPM ZDDP in the stuff any VOA here? I recommend you stay under 1200-1500ppm phos to prevent chunking.
_________________________
2014 Nissan Rogue S CVT, OC#4 24210mi-Castrol Magnetec 5W30+ Fram Toughguard Filter 7317
2015 Forester 6MT 5Door, OC#7 50318mi-PEAK 0W20+Subaru Filter

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