LIQUI MOLY – LIQUI MOLY Marine & PWC Oils - 4 L, including Marine 4T Motor Oil SAE 10W30, 10W40, 25W40 and 25W50, Marine 4T New Generation SAE 15W40, Marine PWC Motor Oil SAE 10W40, Marine Single Grade SAE 30, and Marine 2T DFI. Four litres is the practical size for a full oil change rather than a top-up, and that is what this shelf is for. Most modern outboards, sterndrives and personal watercraft take somewhere between three and five litres, so a single 4L jug does the whole job with a little margin for filling the filter. The Marine 4T range spans light 10W30 for cooler water and lower-load cruising through 10W40 as the all-round choice, up to 25W40 and 25W50 for hot climates and engines worked hard all day. Marine 4T New Generation SAE 15W40 serves engines specifying that grade, while Marine Single Grade SAE 30 covers older and industrial-style powerplants that were designed around a monograde fill. Marine PWC Motor Oil SAE 10W40 targets high-rpm ski engines specifically, and Marine 2T DFI is formulated for direct-injection two-stroke outboards, where the oil must burn cleanly at very low ratios.