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AMSOIL Oil Analysis
The OAI All-In-One Sample Kit bundles a vacuum sample pump, sample tubing, three bottles, and three oil-analysis tests in one package. Pull three samples from one vehicle or spread them across several machines.
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| Product code | Package size | Unit of measure |
|---|---|---|
| KIT18-EA | Each | Each |
The OAI All-In-One Sample Kit (product code KIT18-EA) packages everything required to collect three used-fluid samples and submit them to Oil Analyzers Inc. for laboratory testing. The kit is built for vehicle owners, fleet managers, and equipment operators tracking lab-grade evidence of engine, transmission, and differential health before extending drain intervals or chasing a suspected mechanical issue. Shipping to the lab is paid by the sender on this version of the kit.
KIT18 ships with three 3-oz. sample bottles, three sample test forms, three pre-printed mailers, a vacuum sample pump, 25 feet of sample tubing, and step-by-step sampling instructions. The same three-test panel that goes with the OAI Full-Service Kits is included, so each bottle returned to the lab unlocks the full analysis package documented below.
Every sample runs through the standard OAI used-oil panel: 24 metals by inductively coupled plasma spectroscopy (ICP), covering wear metals, contaminant metals, multi-source metals, and additive metals. Engine samples add percent fuel dilution and percent soot. All samples include water percent by crackle and oxidation/nitration to flag combustion byproducts and thermal degradation. Viscosity is measured at 100°C for engine samples and at 40°C for non-engine drivetrain samples. Base number is reported on engine samples, and acid number is reported on non-engine samples to track additive depletion and acid buildup over service life.
The three-sample design supports two practical workflows. A single vehicle can be sampled across engine, transmission, and differential in one purchase to baseline an entire drivetrain. Alternatively, three different vehicles in a household or small fleet can each contribute one sample, which keeps per-sample cost down for routine condition monitoring. The vacuum pump and 25 feet of tubing allow pulling samples through the dipstick tube without dropping pans, which keeps the process clean and repeatable between visits.
Laboratory analysis of used oil and other drivetrain fluids surfaces internal wear, contamination, and lubricant condition that cannot be seen by inspecting the drained fluid. Rising iron, aluminum, copper, or chromium can flag accelerating component wear before failure. Fuel dilution and soot reveal injector, ring, or EGR issues on engine samples. Water percent, oxidation, nitration, and acid or base number trend the lubricant itself, which is the data point needed to verify whether a drain interval is being extended safely or pushed past its limit. A qualified lab interpreting the full panel can flag mechanical problems while there is still time to act.
KIT18 is approved for all drivetrain fluids, which covers engine oil, transmission fluid, differential fluid, gear lubricant, hydraulic oil, and similar service lubricants. The kit is not designed for coolant samples; coolant analysis requires a different OAI kit and a different test panel. Mixing fluid types in a single bottle is not supported by the test workflow, so each of the three sample bottles should hold one clean sample from one component.
The All-In-One Sample Kit is a maintenance and diagnostic tool rather than a chemical product, so its service cadence is defined by the sampling schedule the owner sets. Common use cases include verifying an extended drain interval, baselining a newly purchased used vehicle, troubleshooting an unexplained noise or pressure reading, and tracking long-term fleet condition.
For accurate trend data, samples should be pulled at consistent service-hour or mileage intervals, every bottle should be labeled with the matching test form code, and shipment to the lab should happen promptly so the analyst is not reading an aged sample. The kit does not include pre-paid postage on this version, so postage is the sender's cost.
| Property | Value |
|---|---|
| Master product code | KIT18-EA |
| Sample bottles included | Three, 3-oz. each |
| Sample test forms included | Three |
| Return mailers included | Three |
| Vacuum sample pump | Included |
| Sample tubing length | 25 feet |
| Analysis tests included | Three (one per sample) |
| Approved sample types | Engine oil, transmission fluid, differential, gear, hydraulic, and other drivetrain fluids |
| Not approved for | Coolant |
| Postage to lab | Not prepaid (sender pays shipping) |
| Test panel | 24 metals by ICP, fuel dilution, soot, water by crackle, viscosity at 40°C or 100°C, oxidation and nitration, base or acid number |
The OAI All-In-One Sample Kit, Non-postage Paid is sold as a single unit under product code KIT18-EA and ships ready to collect three samples. Unopened, unused returns are accepted within 30 days. To match the right AMSOIL lubricant to the vehicle being sampled, see the AMSOIL Vehicle Lookup Guide, and for diesel engines specifically, the AMSOIL Diesel Oil Guide covers viscosity, OEM spec, and drain-interval planning. Order Now
Each of the three sample bottles is tested for 24 metals by ICP (wear metals, contaminant metals, multi-source metals, and additive metals), water percent by crackle, and oxidation and nitration. Engine samples also report percent fuel dilution, percent soot, viscosity at 100°C, and base number. Non-engine drivetrain samples report viscosity at 40°C and acid number. The panel matches the test package shipped with the OAI Full-Service Kits.
No. KIT18 is approved for all drivetrain fluids, including engine oil, transmission fluid, differential fluid, gear lubricant, and hydraulic oil, but it is not approved for coolant. Coolant analysis requires a different OAI kit with a different test panel and sample bottle.
The contents and the three-sample test panel are identical. This Non-postage Paid version requires the sender to apply postage when mailing each bottle to the lab. The pre-paid variants include shipping in the purchase price.
The three slots can be spent on a single vehicle by pulling engine, transmission, and differential bottles, or they can be split across three different vehicles for routine condition monitoring. Each sample is collected through the vacuum pump and 25-foot tubing, labeled on its own sample test form, and shipped in its own mailer.
A used-oil panel surfaces wear metals, contamination, and lubricant condition that visual inspection cannot. Trending iron, aluminum, copper, and chromium can flag accelerating wear before mechanical failure, while fuel dilution, soot, water, oxidation, and base or acid number show whether the lubricant still has service life left in it.
No. The KIT18 panel tests AMSOIL synthetic lubricants and conventional lubricants on the same instruments. Owners running AMSOIL Signature Series, Heavy-Duty Diesel Oil, or other AMSOIL formulations often pull a sample at the planned drain to verify the lubricant still has additive headroom for the next service cycle.