Technical Bulletin: Oil Filter for Kia and Hyundai Applications

At G.U.D. we ensure our customers and colleagues are well informed of our responses to filter product trends and changes in the automotive marketplace. For some time, we have been tracking an issue involving occurrences of aftermarket-branded spin-on oil filters showing evidence of ‘over-pressurisation’ on specific Kia and Hyundai vehicles.

We have now gone above and beyond our normal design standards to cater to this engine design irregularity and to assist our valued customers driving these vehicles. Many people are under the mistaken impression that the oil filter regulates the overall oil pressure of the engine. This is not true. This function is the responsibility of the oil pump regulating valve located within the engine.

An overpressurised spin-on oil filter is the result of the engine oil system pressure exceeding the filter failure pressure. Normal engine oil system pressure is 2.5 to 4 bars whereas G.U.D. filters are designed to operate 2 to 3 times higher at 10 bars with a minimum failure pressure of 18 bars.

There are a number of reasons that engine oil pressure would increase dramatically and exceed the maximum pressure rating of an oil filter. The vehicle/engine manufacturer would be in a better position to share expertise on the subject. The fact is that there are certain Kia and Hyundai engines that operate in isolated cases outside of these constraints which can then cause overpressurisation of the oil filter. Our ‘above and beyond’ response is that we have redesigned a specific oil filter just for these engines to withstand the higher pressures caused as a result of this irregular engine design.

In response to this, we have replaced the Z91C oil filter listing for Hyundai & Kia models from 2010 onwards to Z719, in order to mitigate potential engine failure due to loss of oil from an overpressurised filter. Please ensure that your systems and catalogues are updated to reflect this.

This does not affect our filters for all other engines, which follow our design principles that have stood the test of time of 70 years in the market. Our pledge is that we stand behind the quality and performance of our products under normal engine operating conditions. When properly installed as per instructions on the filter (i.e. hand tight + ¾ turn), our filters comply with vehicle manufacturer engine requirements. Our policy on warranty claims due to over-pressurisation hence remains unchanged.

For any further questions please contact our Technical Help Desk, on +27 (31) 910 3267