LIQUI MOLY – LIQUI MOLY Top Tec Motor Oils, including Top Tec 4100, 4110, 4200 New Generation, 4600, 6100 and 6600 motor oils, Top Tec MTF 5100 Gear Oil SAE 75W, Top Tec Gear Oil EV 510, and Top Tec Truck 4350 and 4450. Top Tec is the brand's workhorse premium range, and the numbering is a shorthand for which engine family a fill was designed around. Top Tec 4100 and 4110 SAE 5W40 suit engines wanting a robust mid-weight synthetic, 4200 New Generation SAE 5W30 remains one of the most widely specified low-ash oils for diesels with particulate filters, and 4600 SAE 5W30 and 4210 SAE 0W30 cover newer approvals with tighter emissions requirements. The 6000 series goes lighter still, with 6100 SAE 0W30 and 6600 SAE 0W20 aimed at modern low-viscosity engines where faster cold-start flow and reduced internal drag translate directly into fuel savings. The range reaches past the sump too: Top Tec MTF 5100 Gear Oil SAE 75W serves manual gearboxes needing easy cold shifting, Top Tec Gear Oil EV 510 addresses electric-drive units, and the Truck 4350 and 4450 grades handle commercial diesels on long drain intervals.