[KTL]

Many of the recommended good oils for our engines are 15W40 grade. So if that makes you feel better, go with it. But ultimately the overpressure valve is going to dictate your oil pressure at higher rpms.

I would feel MUCH more comfortable running a 20W50 or 15W40 multigrade, especially in hot weather, vs. a single grade. My recent engine failure I believe was partly attributed to the 30WT break in oil not providing the necessary film strength. Shoulda switched to the tried and true 20W50 before going very hard on it.....