used oil flows like water

[FrankWest]

I am using Valvoline Daily Protection Non-Detergent SAE 30 Conventional Motor oil and just changed it and the old oil flowed out like water. Should I be using sae 40?

 

[ronn]

not really- the 30 is sufficient. Truthfully, either is fine, unless you are in an extremely cold climate.

 

[The Master Cylinder]

Maybe it is diluted. Is your engine running excessively rich?

 

[Bob C]

Did the old oil smell like gas?

 

[WHN]

Wow! Another question on oil. Everyone has their own ideas including me.

If it’s a higher mileage engine. I think SAE 30 might be to light. I like to use 20-50 HD. I could go on about why but this is just my go to Model A engine oil.

 

[eagle]

Do you have a downdraft carb and manifold by chance? If so, then a leaky float valve will run gas into the engine. Ends up in the oil.

 

[nkaminar]

All good comments.

I run Valvoline 20W-50 racing oil.

 

[Fullraceflathead]

If it's diluted with a lot of fuel it'll definitely be thin!!!

 

[katy]

Was the oil hot? Or had it been sitting and cooled down?

 

[Jim/GA]

I am using Valvoline Daily Protection Non-Detergent SAE 30 Conventional Motor oil and just changed it and the old oil flowed out like water. Should I be using sae 40?

Attached are scans of 1931 Ford Instruction Book (Owners Manual).