COF-21103 — Heavy-Duty Spin-On Oil Filter | 6-PACKSix Full-Size Filters. Stocked, Shelved, Ready to Work.
This is the big-canister filter — built for engines that ask a lot of their oil: trucks, V8s, and anything that tows, hauls, idles hot, or runs long highway miles. Those engines get serviced often and under load, which is exactly why you don\'t want to own just one filter at a time.
The 6-pack keeps you covered for the long haul. Six genuine COF-21103 filters, boxed and on the shelf, at the lowest per-unit price we offer — enough to run a work truck for years or keep a small fleet moving without a parts run.
What\'s Inside Each Filter
A high-efficiency pleated media pack with generous surface area, engineered to hold a serious volume of dirt, soot, and metal without ever choking off flow — so it keeps filtering hard deep into the interval instead of loading early and passing unfiltered oil through the bypass. A silicone anti-drainback valve traps oil in the canister at shutdown, so every cold start gets instant pressure instead of a dry, metal-on-metal spin-up. A calibrated bypass valve guarantees flow in sub-zero starts or under a fully loaded media pack. Sealed in a rugged steel housing with a precision-cut M22 x 1.5 thread and a nitrile base gasket that seats square, seals leak-free, and spins off clean every time.
Direct-fit replacement. No adapters. No guesswork. Six times (6-Pack)Costa Part #COF-21103 (Short: COF2222)Quantity6 filtersFilter TypeSpin-on, full-flowThread SizeM22 x 1.5Anti-Drainback ValveYes — siliconeBypass ValveYesHousingSteel canisterGasketNitrileStandardMeets or exceeds OEM requirementsCross-Reference — Fits Wherever These Fit
Running a different brand now? The COF-21103 is a direct interchange for all of the following:
BrandPart #BrandPart #OEM (AC Delco / · · 1M1-113Premium class=\"font-claude-response-body break-words whitespace-normal\">Cross-references shown for fitment identification only. Costa Filters is not affiliated with, endorsed by, or sponsored by any brand listed above. All trademarks belong to their respective owners. Confirm fitment for your specific application before purchase.Who the 6-Pack Is For
- Truck and V8 owners running shorter intervals under load — you go through filters, so buy them like it
- Small fleets, contractors, and shops who need stock on the shelf, not a parts run mid-job
- Multi-vehicle households with more than one big engine in the driveway
- Anyone stocking up — the per-unit price never gets better than this
Why Drivers Switch to Costa
- OEM spec without the brand-name markup. You\'re paying for filtration, not somebody\'s ad budget.
- Full-size, high-capacity media with the margin to go the distance on hard-working engines.
- Silicone anti-drainback valve — stays flexible and holds its seal through hot-cold cycling far better than the cheap nitrile flaps in economy filters.
- Lowest cost per filter we offer — six at once is the cheapest way to own this part.
- Backed by Costa. Doesn\'t fit or doesn\'t perform? We make it right.
Confirm fitment using OEM part number PF48 or any cross-reference code above.
