How much of a 24oz. bottle of lucas transmission additive should I put in my 3.0L V6 all or half?

For a 3.0L V6 engine, you typically want to use half of a 24 oz. bottle of Lucas Transmission Additive, which is about 12 oz. This amount is generally sufficient for most applications, but it's always best to consult your vehicle's owner manual or a professional mechanic for specific recommendations based on your transmission's condition and needs. If you're addressing a specific issue, such as slipping or rough shifting, you might consider using the full bottle, but again, verify this with a professional.