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I used semi synthetic which I believe is Ford spec

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Thanks mate, thats what I thought but just wanted to double check after reading that other people use fully.

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You have to use a 5W-30 oil that meets Ford Spec WSS M2C 913-B for the Fiesta ST, (don't use anything else!) .. here's a company in the UK that has a few different ones and they have free UK delivery

http://www.opieoils.co.uk/c-698-wss-m2c-913-b.aspx

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Thanks for the website mate its good. Just ordered the oil and and K&N service kit

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Yep, the Castrol Magnatec 5W-30 A1 Fully Synthetic Engine Oil is the one Ford recommend.

I picked up two 4 litre bottles from Halfords for £48 and because I spent > £50 (bought some cheap rubbish car shampoo for cleaning the flags) I got a £10 voucher for use in store.

Effectively therefore it was around £40 (kind of).

Just so you know, you need more than one 4l bottle.

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Yep, the Castrol Magnatec 5W-30 A1 Fully Synthetic Engine Oil is the one Ford recommend.

I picked up two 4 litre bottles from Halfords for £48 and because I spent > £50 (bought some cheap rubbish car shampoo for cleaning the flags) I got a £10 voucher for use in store.

Effectively therefore it was around £40 (kind of).

Just so you know, you need more than one 4l bottle.

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I need more than one 4L bottle? That I didn't know. How much do I need?

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The Fez ST takes 4.3L including the oil filter .. don't overfill it! .. they don't like it, 5L is way too much! ..

And yes, it's a pain that Magnatec Pro A1 only comes in 4L and 1L bottles but that's the way it is, you'll have to buy both to make up the 4.3L you need .. at least you know you're getting the right stuff for your ST ..