# Oil Filter Cap Replacement in Upland > Cracked or stripped oil filter housing cap? Route 66 Auto Repair in Upland replaces cartridge filter caps and O-rings and torques them to spec. Call today. Source: https://route66autorepairshop.com/oil-change-services/oil-filter-cap-replacement Updated: 2026-09-17 Business: Route 66 Auto Repair, 1775 W Foothill Blvd, Upland, CA 91786, (909) 608-7699 Hours: Monday to Friday 8 AM–5 PM, Saturday 8 AM–2 PM, Sunday closed **TLDR:** A cracked **oil filter cap** or a pinched **O-ring** can dump oil quickly. We replace the cap, check the housing threads, and torque everything to spec. Many newer engines use a cartridge oil filter that sits inside a housing closed by a plastic or aluminum cap. Route 66 Auto Repair in Upland replaces caps that are cracked, stripped, rounded off or leaking at the O-ring. Plastic caps take years of heat cycles under the hood, and Inland Empire summers speed that along. We inspect the housing threads too, because a new cap on a damaged housing only moves the problem. Every job starts with a written estimate and ends with a leak check. ## Why do oil filter caps crack? The cap on a cartridge housing is usually glass-filled plastic. It heats up with the engine and cools overnight, hundreds of times a year. After enough cycles, the plastic gets brittle. A cap that was overtightened at a previous service may already have a hairline crack at the hex. The other common failure is the O-ring. If it is reused, rolled out of its groove, or the wrong size, oil weeps down the housing. That looks like a cap problem but is often a technique problem, which is why we check both. Oil that has already spread across the engine is traced with our [engine oil leak repair](https://route66autorepairshop.com/oil-change-services/engine-oil-leak-repair) process. ## Signs your filter cap needs attention - Oil wetting the top or side of the filter housing - A cap hex that is rounded and will not take a socket - A visible crack in the cap body or around the threads - Oil smell in the cabin vents after a hot drive - A cap that will not seat flush when turned by hand ## Our filter cap replacement process 1. **Inspect:** We look at the cap, housing threads and surrounding area, and photograph any crack or damage. 2. **Remove safely:** Rounded or seized caps get the right cap tool, not pliers, to protect the housing. 3. **Replace:** A new cap, new O-rings and a new cartridge go in, lubricated and seated correctly. 4. **Torque and check:** The cap is torqued to the value stamped on it or listed by the maker, then the engine runs while we watch for seepage. ## What's included in a filter cap replacement - New oil filter cap matched to your engine - New cap O-rings and cartridge filter element - Housing thread and standpipe inspection - Oil top-off or full change as quoted - Torque to spec and running leak check ## Is it a need-now or need-later repair? **Need now:** - A cracked cap or active drip - A cap that will not tighten **Need later:** - A rounded hex on a cap that still seals, replaced at the next oil change - Light staining with a steady oil level ## How pricing and timing work Most cap replacements are short jobs done during an [oil filter change](https://route66autorepairshop.com/oil-change-services/oil-filter-change). The price changes if the housing threads are damaged, in which case we stop, show you, and quote [oil filter housing repair](https://route66autorepairshop.com/oil-change-services/oil-filter-housing-repair) separately. AAA members save 10% on parts and labor, up to $75. Same-day work happens when the board allows. Call [(909) 608-7699](tel:+19096087699) first. ## Frequently asked questions ### Can I drive with a cracked oil filter cap? We do not recommend it. A crack can open further with heat and pressure, and a cartridge housing can lose oil fast. If you see a crack, park it and call us. We accept tow-ins. ### Why did my cap crack right after an oil change? The usual causes are overtightening, a reused or doubled O-ring, or a cap that was already brittle. We check for all three and write what we found on the repair order. ### Do you use aluminum caps? We can quote either the factory-style cap or an aluminum version where one is available for your engine. Your written estimate lists both options when they exist, and we explain the tradeoffs at the counter. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.