[I30Premium]

Hi, i've an Hyundai I30 Premium 2008 1.6L petrol.

Is the oil needed 5W - 30W Fully Synthetic?

[The Gonz]

I believe that will work.
Castrol Australia - NetLube

[Dazzler]

Yes, that would be fine ...

Supercheap and I assume most other Auto accessory shops have a screen (in store) you can enter your car details in to see which oils are suitable. 

Edit: Oops.. I just realised you are in the UK, but I would suspect any major stores selling motor oil would have a guide to suitable oils for each make and model.

It is also outlined in your owner's manual. We have links to Owner's manuals on here for each model if you have lost yours..

[Lorian]

The exact grade is listed in the handbook.

Often  find an offer at Euro Car Parts - they currently have 50%  off a lot of oils (but do check the actual prices) - code END80

otherwise https://www.opieoils.co.uk/ are recommended - also sell via ebay

[BrendanP]

As my car is a diesel, I always use the Shell Helix oil as recommended in the manual. Shell website also has a oil-selector tool which you can use to double-check it's the right one. I always wait until there's a good deal and then buy 3 or 4 cans. I usually end up buying from Eurocarparts, but have a look on Ebay first because ECP also sell on there under a variety of names, at prices lower than their own website. Last time I bought some Ultra Professional AG 5W30 I paid £16-50 for 5L, but I have paid as little as £12-50.

Try to buy in advance, before you need it, so you have time to wait for a great deal to come along.