Bosch 6091C HEPA Cabin Air Filter

The 6091C is a three-layer filter: a spunbound polyester pre-filter, a meltblown electrostatic core, and a static cotton layer Bosch adds to increase particulate capacity. That media stack is consistent with HEPA-grade construction; Bosch's HEPA cabin-filter category page cites ISO 29463-3 and 99.97% at 0.3 microns, though the claim is published at the product-line level with no part-level test certificate located for 6091C. There is no activated carbon layer, so odors and volatile compounds pass through. Fitment spans the GM family: Silverado, Colorado, Camaro, several Cadillac crossovers, and others confirmed in the cabin-filter finder. The 8.3 x 9.7 x 1.4-inch unit installs behind the glovebox without special tools; owners consistently report a precise, force-free fit. Rated 12-month / 12,000-mile interval; owners report intact media at two years of use.

The right pick for owners of GM trucks and crossovers listed in the fitment guide who want HEPA-grade particulate filtration above the OEM-equivalent baseline: fitment is precision-confirmed across multiple platforms and model years in community reviews, and the multi-layer meltblown media is consistent with the HEPA-grade efficiency tier. Skip if your vehicle is not on the confirmed fitment list, as an incorrect filter leaves bypass gaps that negate any filtration benefit. Skip if you need odor control or VOC reduction: this filter has no activated carbon layer, so look for a cabin filter with a confirmed carbon composite layer for that purpose. Skip if you require independently-verified submicron filtration certification: Bosch's HEPA claim cites ISO 29463-3 on Bosch's own brand page; no independently-published test results traceable to part number 6091C were located.

Passive synthetic-media replacement filter: multi-layer meltblown polypropylene and polyester construction with no chemical exposure pathway during installation; no SDS exists or is required. All-synthetic media construction (meltblown polypropylene, spunbound polyester, foam seal) is landfill-bound at end of service: no recyclable frame component was confirmed from the available spec, and 12-month replacement generates one spent filter unit per year per vehicle.

A cabin filter only does its job if it actually fits your car, and the same vehicle often takes a different part year to year. Before you buy, find the cabin air filter for your vehicle in the CarCareTruth cabin-filter finder: pick your year, make, and model and we'll show the filters that fit it, ranked by our independent score and cross-checked against multiple catalog fitment sources.