FMCSR 396.5(a) Oil/Grease Leak: Driver & Fleet Q&A

It can, but it doesn't always. Across all-time inspection records for 396.5(a), 1,329 vehicles were placed out of service out of 4,930 total citations — a 27.0% OOS rate. That means roughly 1 in 4 cited trucks was sidelined on the spot. For context, the all-FMCSR average OOS rate is 31.4%, so 396.5(a) sits slightly below the overall average. The severity of the leak — volume, location, and fire risk — tends to drive the inspector's call. A seeping gasket is treated differently than a dripping seal pooling near an exhaust component.

A 396.5(a) citation carries a CSA severity weight of 3. That base score is then multiplied depending on how recently the inspection occurred: violations from the last 6 months receive a 3× time-weight multiplier, dropping to 2× between 6 and 12 months, and 1× from 12 to 24 months. The citation falls under the Vehicle Maintenance BASIC (BASIC 5), so it affects both the carrier's Safety Measurement System score and, for driver-specific tracking, the driver's CSA profile. At severity weight 3, this is a lower-end score, but repeat citations stack and the Vehicle Maintenance BASIC has a relatively low threshold for intervention.

Take these steps immediately:

1. Document the leak source. Note whether it originates from the engine, transmission, or another component — the regulation covers all three.
2. Check co-occurring issues. Our inspection records show that in the last 90 days, 396.5(a) citations appeared alongside brake defects (393.48A, 396.3A1BOS), a defective slack adjuster (393.47E), steering wear (393.53B), and missing emergency equipment (393.95A and 393.95F). Have a mechanic inspect all those systems before your next dispatch.
3. Get a repair receipt. Written documentation of the fix protects you if the violation is disputed later.
4. Notify your fleet safety manager so the carrier's BASIC score impact is logged and tracked.

It's moderate in severity relative to peer codes. The 396.5(a) OOS rate of 27.0% sits below the 45.3% OOS rate for 396.3(a)(1) (general inspection/repair/maintenance), which is the most enforcement-heavy peer code in the Vehicle Maintenance category with 236,919 all-time citations. By volume, 396.5(a)'s 4,930 all-time citations rank it #342 out of 3,036 FMCSR codes nationally — present but not among the most-cited. Its 27.0% OOS rate also trails the all-FMCSR average of 31.4%, meaning inspectors are slightly less likely to pull a truck for this code than for the average violation across all categories.

Yes, you can submit a DataQ request, but equipment findings are harder to overturn than paperwork errors. The FMCSA DataQs system (Request for Data Review, or RDR) lets drivers and carriers challenge the accuracy of inspection records. Because 396.5(a) is an equipment-condition violation — an inspector observed a physical leak — a successful challenge typically requires documented evidence that the finding was incorrect: a pre-trip inspection record showing no leak, a repair invoice timestamped before the inspection, or a counter-inspection report. Pure paperwork violations (like missing proof of inspection) tend to be easier to win. Submit your DataQ at the FMCSA DataQs portal and attach all supporting maintenance documentation.

Texas is the only state with recorded citations in the last 180 days. Our inspection records show Texas logged 2 citations for 396.5(a) in that window, with 1 of those resulting in an out-of-service order — a 50.0% OOS rate for the state in that period. All-time, the top carriers cited include UNITED PARCEL SERVICE INC with 31 citations and CRST EXPEDITED INC with 17, suggesting this code appears across high-mileage national fleets operating in diverse states. Enforcement activity has dropped to very low levels nationally, with only 3 citations recorded in the last 12 months.

Fix it before your next dispatch — even though activity is currently low, the OOS exposure is real. With only 2 citations in the last 90 days nationally, 396.5(a) enforcement is at a low point, but that doesn't reduce the physical risk or legal exposure. Our records show a 27.0% all-time OOS rate, meaning inspectors who do flag a leak put roughly 1 in 4 trucks out of service on the spot. Beyond compliance, co-occurring violations in recent inspections included brake OOS findings (396.3A1BOS) and steering defects (393.53B), suggesting that trucks running with active leaks also tend to have broader maintenance gaps that compound the risk.

It follows both the driver and the carrier. Under FMCSA's CSA system, Vehicle Maintenance BASIC violations are attributed to the carrier's SMS score. However, the citation is also tied to the driver's inspection record and factors into driver-specific SMS data that carriers can access when vetting new hires. The 396.5(a) severity weight of 3 is applied to both profiles with the same time-weighted multiplier. For drivers moving between carriers, a history of equipment-condition violations like oil/grease leaks can affect hiring decisions, since carriers review driver inspection histories through FMCSA's Pre-Employment Screening Program (PSP).