OK. It's August. Temperature is 107 by 2:00 PM. At what point are we riding in too hot of air? 10-40 synthetic. 450CL. There's a long, steep grade nearby I have to take to get out of town. Took that grade in 82 degrees early this morning as a test. Engine ran fine but oil dipstick mighty hot to handle at the top. Thinking 90 plus might not be a good idea. SAE 10-50? Leave it in the garage and ride Greyhound? I hate to see August interfere with my taking it out of town but it's looking that way.