I think it's fair to day that when oil gets hot, it's viscosity drops. Regardless of what you do, hot oil is more than likely not going to give you the oil pressure that cool oil will. Is it a problem? As one responder to your querry noted, that depends. My '99 Ultra has the updated hydraulic tensioners, the high volume oil pump, an oil cooler and I run Mobil 1 V-Twin synthetic. During the hotter months, when the motor has been running a while, if I pull up to a light, the oil pressure drops to the "0-10" pound range. As soon as I give the motor throttle, it climbs back up. As has been pointed out on numerous occaisions in this forum, HD gauges are not "lab quality". That is, when the gauge reads "32" it could be actually 35 or 27 pounds per sq". And for what it's worth, the exact reading, IMO, doesn't really matter. I see the gauge as an indicator. If every time I ride, I am constantly at "32" regardless of conditions, and then one day I'm at "15", it bears looking into. But truthfully, I have ridden all day and had the pressure stay pegged at "32", and then ridden the next day, in virtually the same set of circumstances and the pressure didn't get over "25". For me, I glance at the guages every so often. But staying focused on a set of gauges that have limited accuracy takes away from the enjoyment of the ride. As a final note, make sure your idle RPM is set at specs. When my idle is set at about 1000, there is a difference in hot oil pressure at idle.....