5.7 Chevy 350 Small Black with 0w-8

[WillBrinkhoff]

There is a good deal that's too hard to pass up on 0w-8. Could I run this in my 5.7 Chevy 350 small block when it's a little colder out. This is the engine that has oil pressure problems I talked about in previous posts. My friends are really trying to convince me to do this, but I'm worried it will make no psi and blow up.
Thanks.

 

[oil pan 4]

There is a good deal that's too hard to pass up on 0w-8. Could I run this in my 5.7 Chevy 350 small block when it's a little colder out. This is the engine that has oil pressure problems I talked about in previous posts. My friends are really trying to convince me to do this, but I'm worried it will make no psi and blow up.
Thanks.

No.

 

[Astro14]

Sure, you can run it.

And your oil pressure problem with that engine will be solved when you lunch a bearing or two…

In all honesty, why even ask on an engine that has poor oil pressure to begin with?

 

[JavierH19]

You're joking right. Only way I'd ever use 0w-8 that I got on sale is if I mix it with 20w-50 to thicken it. I'd never use just 0w-8 in that engine, it's going to spin a bearing. You need new friends if they want you to do this. Only way I'd run 0w-8 in that truck is if I need it to start up in -60f Siberian weather or something where engines there struggle to crank and keep warm and can't even keep 150f water temps.

 

[WillBrinkhoff]

You're joking right. Only way I'd ever use 0w-8 that I got on sale is if I mix it with 20w-50 to thicken it. I'd never use just 0w-8 in that engine, it's going to spin a bearing. You need new friends if they want you to do this. Only way I'd run 0w-8 in that truck is if I need it to start up in -60f Siberian weather or something where engines there struggle to crank and keep warm and can't even keep 150f water temps.

I can mix it with 20w-50 and get normal oil?

 

[JavierH19]

I can mix it with 20w-50 and get normal oil?

For the most part though you could use m1 15w-50 for something with a better base stock. Basic 20w-50 mixed in is still better than just running pure 0w-8, it'll spin a bearing. Half 8 and 50 grade results in a thin 30 around the 9cst range which is what it uses.

 

[Astro14]

I can mix it with 20w-50 and get normal oil?

Depends what you mean by “normal”. You can get a rough idea of what viscosity will result from your mix by using this:

https://www.widman.biz/English/Calculators/Mixtures.html

 

[Trav]

Order a new engine at the same time. Honestly the engine bearings are going for a hop in this engine. Use the correct oil and use the 0w8 for your oil can.

 

[kschachn]

There is a good deal that's too hard to pass up on 0w-8. Could I run this in my 5.7 Chevy 350 small block when it's a little colder out. This is the engine that has oil pressure problems I talked about in previous posts. My friends are really trying to convince me to do this, but I'm worried it will make no psi and blow up.
Thanks.

Blow up you say? And why would your friends try and convince you?

Here are a few previous threads on this topic, at least one covers using the grade in an engine where it is not recommended:

https://bobistheoilguy.com/forums/threads/0w-08-engine-oil.385724/#post-6966382

 

[Astro14]

There is a good deal that's too hard to pass up on 0w-8. Could I run this in my 5.7 Chevy 350 small block when it's a little colder out. This is the engine that has oil pressure problems I talked about in previous posts. My friends are really trying to convince me to do this, but I'm worried it will make no psi and blow up.
Thanks.

If it blows up your engine, it is not, and never will be, a good deal.

Why even ask if you are concerned about it?

 

[JeffKeryk]

Friend, do not run 0w8 in that engine. A nice 10w30, or heavier, is required. If consumption continues, go up or consider a rebuild.

 

[Cujet]

I'm guessing this thread is a bit of fun from the OP.

From a practical standpoint we racers have been experimenting with ultra thin oils for many decades. It was one of the ways that NASCAR was able to consistently top 200MPH at the faster tracks. By swapping out the 20W-50 racing oils and replacing with the

I even tried ultra thin oils in my 1.8L Mazda racer with predictable results and the resulting engine overhaul.

The result is always rapid rod bearing wear and faster ring/cylinder wear. However, we learned that by managing the oil temps down into the 160 degree range, the ultra low viscosity oils can not only keep an engine alive, but can provide adequate protection despite the increased wear rates.

 

[Bottom_Feeder]

Yes, please run a hugely incorrect oil spec in an old engine just for the sake of saving a few dollars and tell us how it turns out.

 

[thastinger]

Do you have an oil pressure problem or an oil flow problem?

 

[AZjeff]

99% sure you're being trolled fellas.....

 

[SC Maintenance]

Save all your money and just don't change the oil. Same net affect eventually.

 

[4WD]

There is a good deal that's too hard to pass up on 0w-8. Could I run this in my 5.7 Chevy 350 small block when it's a little colder out. This is the engine that has oil pressure problems I talked about in previous posts. My friends are really trying to convince me to do this, but I'm worried it will make no psi and blow up.
Thanks.

Please do.

 

[brandon9715]

In your last post you asked if you could run 5w30 in place of 5w20. Now you are asking about 0w8 in a 350 small block. If this isn't a troll account...

 

[Astro14]

Question answered. Now we are discussing the OP. So, let’s end it here.