late winter riding: am I using the right oil?

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I have a Harley sportster in which I'm running a mix of 50% Pennzoil 20w50 (conventional dino auto oil) and 50% Royal purple 20w-50 synthetic motorcycle oil. The oil has only about 1500miles on it and I thought I would wait until the early summer and then change the oil over to Valvoline at that time. Unfortunately, we here in the midwest are having an unseasonably cold late winter / early spring with temps ranging from 25F to 35F. Despite the 50% synthetic RP, is this oil not right for the lower temps? Or will be ok for 200-300 miles until spring (hopefully) makes it appearance. If its not right what weight? 10w-40?
 
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If the bike is in a heated garage when you start it up, then Id worry less, but 20wt oil at startup will take a while to circulate if the bike is outside or in a cold garage. Im pretty sure HD calls for a thinner oil in those operating temps.
 
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It maybe apples and oranges, but my 528e starts fine at 10F with 20w50 dino in the sump. Drive easy the first few miles.
 
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I remember seeing somewhere an article about how long it took different viscosity oils to reach all parts of a V8 engine in cold conditons(I think it was a Ford, but I don't recall what specific engine), and for thicker oils it was over 30 seconds. That is a long time to run dry at every cold start up. It may not be audible or noticeable, but there may be accelerated start up wear.
 
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Mixing brands for a fill is not a good practice. Additive package clash, not to mention RP consistently ranked at the bottom of AMSoil's tests.
 
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Just to answer your question NO you're not using the right oil. Why would you mix conventional Dino oil with a high quality synthetic like Royal Purple in an air cooled motorcycle? Why don't you just run straight 20w-50 Mobil One, or Valvoline VR-1, Schaffers Supreme 7000, Amsoil, Royal Purple??? Another option is Mobil One 15w-50 for year round protection.. What does your HD owners manual state to run at cold temps? Probably 15w-40... Try 15w-40 diesel oil like Rotella for cold temps over the winter..
 
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