Inside Line: Comma


A few notes about the Hyundai i30 (up to 2012):

Engine Oil

Hyundai tend to favour a product like 5W30 for most of their vehicles however the very latest engines may carry different recommendations so you should always check an application guide like ours before fitting any product.

Some of the engines options fitted in the Hyundai i30 have quite small sumps – the 1.4-petrol for example has a 3.3-litre sump with a further 0.3-litre held in the filter. Supplying the customer with a top up pack and reminding them that they should be checking the engine oil regular might also be prudent here particularly if you have noticed that the oil needed topping up when it was brought in. A quick check before you change might be a good way of reinforcing the importance of top up to the customer. Combined with longer service intervals (up to 12,500 miles) and the increased use of sensitive components like turbochargers, a smaller sump size makes checking your oil more critical than ever before.

Brake Fluid

In the main, Hyundai specify a conventional DOT 4 brake fluid however it’s always worth checking an application guide before fitting any product.

Most people don’t think of brake fluid as a service item however, as with many manufacturers, Hyundai specify a change interval of 24 months for the i30. Brake fluid degrades over time by absorbing water from the atmosphere, which lowers its boiling point. Boiling point is a critical factor in brake fluid performance because of the amount of heat generated during braking. If the boiling point of the fluid is too low then continuous or hard braking may cause the brake fluid to vapourise which in turn can result in a loss of hydraulic pressure within the system. The message here is that brake fluid is a safety critical item so check and change when specified – don’t assume that it will just be OK.

Power Steering Fluid

The Hyundai i30 is fitted with a purely electrical power steering system so no power steering fluid is required. You will notice that Power Steering fluid is not mentioned on Comma’s application guide available at for any of this range’s vehicles.


Hyundai use an OAT based coolant for all of the i30 range. As with any other fluid, the important thing is specification and again you use an application guide if you are left in any doubt.


For this particular model, Hyundai use a couple of transmissions that includes manual and conventional automatic, each with a different fluid recommendation. As well as the differing fluid requirements, change intervals and capacities will vary depending on the type of transmission so we would advise you to consult the handbook to ensure that you get the right product for the vehicle you are servicing.

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