...as long as the spec is correct & it's from a reputable manufacturer. The difference between £20 & £40 for four litres is probably minimal compared to warming it up for an extra minute and not lugging it about in too high a gear.
And modern oil filters are designed to last something like 20 000 miles. Obviously I'm not advocating this for an air/oil cooled engine...
Just get the thing warm & give it a regular thrashing, that's what they all want, the scarlet jezebels!
