Railguy

I m going to change the oil in my 350 . Its got maybe 8 to 10 k on it . I ve been using 10w 30 full synthetic. The oil pressure is plenty high . Is there any problem with using 0 weight oil ?
Railguy

BangScreech4-4-2

Why would you want to?

MDchanic

+1.

The engine is not designed for that.

May work fine. May not. You're welcome to do the experiment.

- Eric

jensenracing77

Are you talking 0w 30? If you are I would not see why it would make a difference at operating temperature.

rustyroger

How cold is it where you are?. If its single figure or minus temperatures then that's what 0 weight oil is good for. You will have oil all round the engine very quickly.
However your engine was never designed for such oil, it could be the bearing clearances are too great for it.
An accurate oil pressure gauge would be a good idea imo, if the pressure doesn't come up to what you got with 10w30 then drain it out again and tell us please so we all can learn.

Roger.

RROLDSX

I ran 10W30 I my all my cars through -40d winters and it was fine. Obviously you have to let the car warmup before you go at that temp. I believe the new oil ratings will even perform even better in the cold.

Railguy

I had heard it offered less resistance which would give you few more hp. Since my oil pressure was high . But that's why I asked first . I think I'll stick with 10w 30 full synthetic Castrol. I don't run it in cold weather.
Railguy

BangScreech4-4-2

Good plan.

coppercutlass

Your best gain in hp against oil drag is to get the crank out of the oil. so a deep sump oil pan is the way to go . I ran 15 w 40 rotella for years recently went to 20 w 50 vr1. fired up the olds today was 20 degrees . No issues strating up .

MDchanic

Remember, the two numbers represent the measured viscosity at two temperatures (0°F and 200°F, or something like that, if I recall), so 0W30 and 15W30 should perform exactly the same at operating temperature, and give exactly the same MPG.

Similarly, in most cars I've had, I've noticed a significant cold cranking difference between 5W30 and 10W30 in very cold weather (say -10°F).

- Eric

Railguy

I have a deep sump oil pan. When we did the motor I lightened the crank and knife edged the crank both sides. Stock crank out of a 74 . I. don't even think it was forged or nodular. Everything s been balanced. It's seen over 6000 and held together.
Roads have been sindered hear so it will be in the garage for a while.

I just made our reservation for cruisin oc. Can,t wait till spring.
Railguy

coppercutlass

You shouldn't have an issue with oil drag then. If you properly fill the oil it should stay in the sump and off the crank. I'm actually going to try 10w30 this spring. Mainly for thermal properties.

Fun71

Forged cranks were used in 330s only; all other SBO cranks are nodular cast.

Koda

Lightweight oil is for overhead cam engines. Run what the engine was designed for.

Railguy

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I picked this up for my wife's car but didn't use it. What do you think of it. I was thinking of putting 3 or 4 quarts of 10 w 40 with it. Same kind. I have 7 quart oil pan. I always buy an extra quart so if I have to add later I ll know what kind is in it.
How many people get their oil changed wherever and don't even know what'sused. Then just add whatever from a gas station or convenience store.
Railguy