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Old 06-28-2011, 09:11:13 AM   #1
janis80z28
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suggestions on oil weights

i have a 1985 rebuilt 350, from the block up. its now a 383 stroker. What weight oil do you recommend?

it has 700 miles on the motor already.
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Old 06-28-2011, 10:34:41 AM   #2
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do you know what the bearing clearances are? Assuming it has normal (1.5-2 thousandth) clearances I would just run 10W-30.
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Old 06-28-2011, 11:12:27 AM   #3
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10W30 synthetic.
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Old 06-28-2011, 12:13:43 PM   #4
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Quote:
Originally Posted by Cardinal
10W30 synthetic.

Better know for sure that there are no cork gaskets. I would guess that there aren't but I would rather know for absolute sure. Synthetic is death to cork gaskets. That's the main reason I haven't started running synthetic in my 73. Once I am able to pull the motor and replace all the gaskets and everything I will start running synthetic. You did give the weight that I was gonna recommend though.
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Old 06-28-2011, 01:48:28 PM   #5
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I did do a bit more digging. 10w 30 looks like the one. BUT I see people saying to add ZDDP. What do you guys think of adding this stuff to the oil?

not doing synthetic for now.
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Old 06-28-2011, 01:57:35 PM   #6
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Whatever gives you atleast 20lbs of pressure at idle, in gear with a hot engine.

Could be 5w-20

could be 20w-50

Start with 10w-30 and see...

Your 1500 rpm and up pressure will probably be 45 lbs and up on any of the oils.
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Old 06-28-2011, 02:42:19 PM   #7
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Old 06-28-2011, 05:00:47 PM   #8
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Quote:
Originally Posted by hhott71
Whatever gives you atleast 20lbs of pressure at idle, in gear with a hot engine.

Could be 5w-20

could be 20w-50

Start with 10w-30 and see...

Your 1500 rpm and up pressure will probably be 45 lbs and up on any of the oils.
I agree. I'm getting 18 to 20 psi. at warm idle with both 5W-30 or 10W-30. The main difference between the two is at cold start up. With 5W-30 my oil pressure is right at 60 psi. and with 10W-30 it's 65 psi. My oil pressure drops a little quicker with 5W-30 as my engine gets up to operating temperature. Once it's up to operating temperature, they're the same.

At cruising speeds my oil pressure is anywhere between 40 and 60 psi. depending on my engine speed.
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Old 06-28-2011, 05:29:26 PM   #9
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Synthetic is murder on cork gaskets? I ran Mobil 1 in my '79 Olds with a 300 hp 350 SBC for 86K miles and it never leaked a drop of oil out the valve covers.
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Old 06-28-2011, 06:13:09 PM   #10
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Quote:
Originally Posted by Cardinal
Synthetic is murder on cork gaskets? I ran Mobil 1 in my '79 Olds with a 300 hp 350 SBC for 86K miles and it never leaked a drop of oil out the valve covers.


It is just an old wives tail. The real proven truth is that dino oil gums up and sludges up much easier than synthetic. What this does to an engine that is getting older and getting miles on it is form deposits around already deteriorating gaskets and keeps them from leaking. A switch to synthetic starts cleaning up those deposits and suddenly a leak starts and the synthetic gets the blame. Synthetic oil itself does not deteriorate any type of gasket material.


P.S. To anybody interested I get dealer pricing on all amsoil products. I am not a dealer. I have a business account with them for my lawn service. I use amsoil in everything because I get a good price on it and it truly is great products. If anybody wants I can get you dealer pricing on anything amsoil sells. Just PM me. That Z-Rod oil i posted above in over $9 a quart street price. It is about $7 my price which is still high but it is a "REAL" synthetic Group 4 base stock.
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Old 06-28-2011, 07:49:04 PM   #11
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I have never ran anything but Valvoline 20/50 racing. Works great in our climate, which ranges form 32°F+ to 115°F, plus has ZDDP...Robert
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Old 06-28-2011, 10:37:43 PM   #12
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Quote:
Originally Posted by 455 Formula
I have never ran anything but Valvoline 20/50 racing. Works great in our climate, which ranges form 32F+ to 115F, plus has ZDDP...Robert
This guy is on to something. You should take your bearing tolerances into account....but ALSO the average climate you live in. Ever looked in a vehicle's owner's manual and saw a temperature chart in the recommended oil section? It's there for a reason.
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Old 06-29-2011, 08:10:28 PM   #13
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15 w 40 Diesel for older engine specs.
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Old 06-29-2011, 10:56:56 PM   #14
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Quote:
Originally Posted by SupplySgt
Better know for sure that there are no cork gaskets. I would guess that there aren't but I would rather know for absolute sure. Synthetic is death to cork gaskets. That's the main reason I haven't started running synthetic in my 73. Once I am able to pull the motor and replace all the gaskets and everything I will start running synthetic. You did give the weight that I was gonna recommend though.
Don't tell my cork gaskets that. They've not leaked in 9+ years.

The front and rear main seals, on the other hand...

hhott's on the oil suggestion, too. I used to always run mine with 10W30 (Mobil1 Syn), but then it started to get a little noisier (very subtle) over time. I switched to 10W40 (still Mobil1 Syn), and it has quieted down quite a bit. I couldn't tell you what my pressure is- no gauge, just the idiot light. If it goes away and I grenade the engine, then new engine for me- YAY!
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