Hi in these sub zero temperatures i,ve been thinking of ditching my 15/50 mobil 1 in my YB engine , would a 10/40 mineral for example be a better choice in this climate?

The other day my tappets took forever to shut up and it got me wondering whether fully synthetic is good for it at -5 degrees like today .

Any thoughts on this ?

CheeRS
Mike

 

For the amount of cold we have there's no point imo, but I wouldn't be using mobile 1 15W40 to start with, a nice 5W50 would be a lot better.
tabetha

 

the standard oil for these cars is 5w40 fully synthetic and i have always run mine on that ford recomendation and never had any probs

 

cheers guys any recomendations at this grade?

 

Std recommended oil is actually 5W30, plain as day in the ford handbook, it is the closest to our temperature.
Oil has come a long way since the days of the yb engine being new, tolerances are much tighter, machining better now.
Even on a fresh engine if you go thrashing, which is good for the oil, it will thin out a lot more than a 50 weight.
tabetha