I would run Delo 15/40 or Rotella 15/40 year round! I wouldn't run Walmart anything! I personally run Delo because I buy it at Costco. I even run it in my '55 VW with a 1700cc engine. The oil pressure will drop as the weather warms up. Idle at 1 bar or 15 psi is ok. If you are concerned about checking the oil pickup, pull the small pan and ck.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.