Hello Everyone, My father seems to be using Castrol Edge FST 10W-60 in his Ford (EU) Focus 1.6i 16V (1998) even though I can see that the official Castrol web-site recommends 5W-30 for this car. I wonder, will there be any damage to the engine by using 10W-60 when 5W-30 is recomended? The car is used in continental climate with hot summers (around 35 c - 40 c) and cold winters (sometimes -20 c) in south Ukraine. The fuel quality is very bad there, I guess a lot of sulpher and other additives you cannot even imagine. My fear is that this oil will be too thick for the engine and it can do some damage ... Am I right?