what oil

5w30, go for a good oil but there's no point in spending £45+ on an ester oil for an engine like that. I would (and do in my Fiesta) use Fords own Formula F fully synth. This is standard oil in the Mk1 Focus RS and there are plenty of lads running 260+hp still using this oil no problemo.

Somewhere had 5ltrs of Formula F for £18 not long ago. Can't remember where but it's only £22 on e-bay.
 
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