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Question about oil used a Harley-Davidson V-Rod engine, it's a single sump set up. H-D book calls for 20-50 unless temp is below 40, the 10-40. Why is 10-40 only ok when the starting temp is below 40? I understand the 10 weight oil flows better at lower temps, but with synthetic does it matter...

When I was just getting into cars and building my first engine, the guy at the speed shop told me the best oil to use is 2QT Mobile 1 10W-30 and 3QT of Conv. Mobile 10W-30 in any american V8, and change every 5K. I still use this to this day, is there anything wrong with doing this? Mark

I have a 1971 Dodge Polara w/318, right now I'm using castrol 10W-30 and changing oil every 3K. I'm getting ready to run a 1951 Chrysler Imperial w/fireball 331ci V8. What oil should I run in this car. Mark