Engine Oil: what's best?

[KWAWD]

Hmm, since the last change i've noticed a bit of increased tappet/lifter noise on a cold start in the morning.
If anything the weather and temps have been warmer, so not sure whats up with that.
Oil level is fine. Maybe the viscosity is changing with warmer conditions.
(Penrite HPR 5w40).

[KWAWD]

Hmm, since the last change i've noticed a bit of increased tappet/lifter noise on a cold start in the morning.
If anything the weather and temps have been warmer, so not sure whats up with that.
Oil level is fine. Maybe the viscosity is changing with warmer conditions.
(Penrite HPR 5w40).

This went away on the next change. Weird. Still happy with the Penrite HPR5.