Mahle Spin-On Oil Filter (OC1379) Fits: Harley Davidson MC. The response from MAHLE: a fully synthetic two-layer fleece made of polyester, consisting of a support and a filtration layer. Motorway use is the easiest condition for oil, the speeds are fairly consistent and rarely push the engine hard, there is plenty of air flow to help cool the engine and the oil has a chance to get up to temperature and flow properly.
