OEM spare parts often have one serious disadvantage: they are simply too expensive. Oil coolers and water radiators are a classic case where there's no need to invest in a costly OEM component. You can be sure that your coolant or engine oil will not be able to tell the difference!
With Louis replacement parts you can rest assured that they're every bit as good as the OEM parts in terms of both performance and quality. And they cost a lot less. So it really is an easy decision to choose Louis products!