Viscosity and additives.
The manual say 20w40 but I use 10w40 normal motor oil with any trouble.
15 is thicker oil and for bigger engines.
yes read your owners manual hotter the thicker the oili use 10w40 and 50 check with your mechanic on 20w40 and 50
0W40 is thinner oil made for the tolerances of the Porsche motor. the bearing clearances will not allow proper flow if 10W40 is used and premature wear will occur.
10w40
10w40
10W40
Use only the weight recommended by Volvo and I doubt that they recommend 10w40.
There is no difference between the term "motor ship" and the term "motor vessel." The two are commonly used interchangeably.
The Correct Motor Oil for this vehicle is a 10W40 Synthetic Motor Oil
yamalube or 10w40