Protect your engine with the Fleetguard Spin-On Lube Filter, a premium replacement for Fleetguard FG LF691A, designed for Caterpillar C10, C12, C13, C15, and C16 engines in Freightliner, Kenworth, Peterbilt, and Western Star heavy-duty trucks. This filter, measuring 12.19 x 5.34 x 5.34 inches and weighing 4.3 lbs, features a 1 1/2-16 UNS-2B thread, cellulose media, and a 30-micron rating with 95% efficiency (ISO 4548-12 standard), ensuring optimal oil filtration to prevent engine wear and maintain performance. It fits or replaces parts from Fleetguard, Caterpillar, Baldwin, and others, including cross-references like Caterpillar 1R0716, 2P4005, Baldwin B99, Donaldson P554005, Wix 51792, and Luberfiner LFP4005. Ideal for fleet maintenance, this Fleetguard filter reduces downtime and costs, providing reliable protection in demanding conditions.