Oil viscosity change volume?

kerryb said:

1970 type 1 motor with dual port heads. Up to now I have run 10w40 oil. I would like to change to 20w50 oil.

If the engine holds 3.2 quarts, but we only put in 2.6 at an oil change, how does this affect my new oil? It would be diluted, am I being a worry-wart?

Thanks for your understanding...

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Jack Klarich said:

If you are doing a total oil change the volume does not change, you might be better off running a sraight weight oil like 50W as Bob suggested

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kerryb said:

Ok, lets say I'm going straight 50w, how much do I put in. My dipstick is wrong, I know that, so I marked it last time I did an oil change. But how do I get the rest out so I can put in the recommended 3.2 quarts so Everything is now 50w? The manual says 2.6 quarts at an oil change.

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kerryb said:

Ok, lets say I'm going straight 50w, how much do I put in. My dipstick is wrong, I know that, so I marked it last time I did an oil change. But how do I get the rest out so I can put in the recommended 3.2 quarts so Everything is now 50w? The manual says 2.6 quarts at an oil change.

Click to expand...