For those that run at lake Elsinore at 75* and 1265' elevation, the same timing at the river (~450', & 115*) MAY be too much...
I run 36-38* in the spring, but when the temps get above 100, I back it down to 34*.
From Parker (350' elev.) to Mead (1100-1150' elev.) makes a small difference, but that's where I boat.
One bad piston is all it takes to ruin your weekend

Dan'l