Oil Line Kits

Oil line kits are the pressurized plumbing that routes engine oil to turbos, remote oil coolers, and auxiliary lubrication systems — and a failure anywhere in that circuit means catastrophic engine damage within seconds. Motor Sport Mayhem stocks 50 oil line kits spanning entry-level steel-braided assemblies to full competition-spec AN-fittings kits, covering street builds, track cars, and purpose-built race engines.

Our Top Picks for Oil Line Kits

Every kit below was hand-selected based on engineering quality, fitment reliability, and proven performance across real-world street and competition applications.

How to Choose the Right Oil Line Kits

The difference between a reliable oil line kit and a liability on the track comes down to three things: hose construction, fitting material and thread standard, and pressure rating. A braided stainless outer jacket over PTFE inner liner is the benchmark — it resists oil degradation, handles sustained temperatures above 300°F, and won't swell under pressure spikes the way rubber hose does. Fittings must be swaged or field-assembled with the correct ferrule and body for the hose ID; a mismatched assembly will pull free at pressure. Know whether your application uses -AN (JIC 37° flare), NPT, or metric thread before ordering — these are not interchangeable and adapters in a pressurized oil circuit are always a weak point.

Key Specifications

Hose line size — expressed in AN dash sizing — directly governs flow capacity and system pressure drop. AN-4 (-4) works for oil pressure sensor feeds and turbo oil supply lines on small turbos; AN-6 (-6) is the standard for most turbo oil drain and remote filter applications; AN-8 and AN-10 are used for high-volume oil cooler circuits and external scavenge systems. Running undersized line creates flow restriction that starves bearings under sustained high-RPM load — an error that shows up as premature bearing failure months after install, not immediately at startup.

Fitting material matters as much as hose spec. Forged aluminum AN fittings are acceptable for low-vibration applications, but stainless steel fittings are mandatory anywhere the line routes near the block, header, or exhaust — aluminum work-hardens and cracks under repeated heat cycling and vibration. For any connection at the turbo oil inlet or outlet, use stainless or nickel-plated steel rated for sustained temperatures above 400°F. Check that the fitting body matches the hose construction — PTFE-lined hose requires fittings with a specific barb geometry; using smooth-bore push-lock fittings on PTFE liner will not seal correctly under pressure.

Pressure rating must exceed your peak system oil pressure with margin. Most naturally aspirated street engines run 60–80 PSI at cold start; turbocharged engines can spike to 100+ PSI on cold oil before the relief valve opens. A quality oil line kit should be rated to a minimum of 300 PSI burst pressure — the working pressure is typically rated at one-third of burst, giving a 100 PSI working pressure with appropriate safety factor. If the kit specs don't list a burst pressure, that's a disqualifying red flag for any performance application.

For forced induction builds, the turbo oil drain line deserves as much attention as the supply — an undersized or kinked drain causes oil to back up into the center section, saturating the shaft seal and pushing oil into the compressor housing. Always route the drain at a minimum 45-degree downward angle from the turbo flange to the pan, with no tight bends. For oil cooler circuits, consult the cooling system thermal load before sizing lines — a higher-volume cooler core requires larger-diameter feed and return lines to prevent starvation on the cooler inlet.

AN Oil Line Sizing Reference by Application

Price Guide

Entry ($1.49–$30): Individual fittings, adapters, and replacement hardware live in this range — correct for single-component replacements and small auxiliary lines, but not for building a complete pressurized oil circuit from scratch. Quality varies widely; stick to established brands even at this price point.

Mid-range ($30–$200): This is where most complete oil line kits land and where the majority of street performance and track-day builders should be shopping. You get properly specced PTFE or rubber-core braided hose, matched fittings in the correct AN standard, and vehicle-specific routing lengths that eliminate improvised cuts and splices.

Premium ($200–$1,535.70): Full vehicle fitting kits, belt-drive fuel system assemblies, and competition-grade crankcase hardware occupy the top tier. These are justified for purpose-built race engines, high-horsepower forced induction builds where OE hardware is a structural limitation, and expedition vehicles where a line failure means being stranded 200 miles from the nearest parts house.

Who Is This For?

Oil line kits serve a wider range of builders than most assume — from weekend autocross drivers routing a remote oil cooler to full race teams plumbing dry sump systems from scratch.

Track / Autocross — 7.6/10

Track use scores at the top of the usage matrix because sustained cornering loads pull oil away from the pickup and push thermal stress onto every fluid line in the system. A braided oil line kit feeding a remote cooler directly addresses the heat soak that destroys viscosity in extended sessions. Autocross builds benefit from the same hardware at a lower cost because event duration is shorter, but correct line routing is still mandatory — a drain line kinked against a chassis rail will fail under sustained vibration.

Racing Competition — 7.6/10

Competition-spec oil plumbing is a technical requirement, not an upgrade, at this level. Sanctioned classes specify maximum hose construction, fitting standards, and in some cases require fire-sleeve over all oil lines within 12 inches of an exhaust heat source. Dry sump systems, external accumulators, and remote filters all require correctly sized and rated AN line assemblies — improvised hardware is a tech inspection failure and a genuine fire risk.

Drag Racing — 7.6/10

Drag applications score equally high because the violent shock load at launch stresses every oil line connection simultaneously. PTFE-lined stainless braided assemblies with swaged or properly torqued fittings handle that shock load without loosening; push-lock fittings and generic rubber hose do not. External oil cooler circuits are common on high-horsepower drag engines that run multiple passes per session with minimal cool-down time between runs.

Street Performance — 7.3/10

Street builds use oil line kits primarily for turbo oil supply and drain on forced induction upgrades, remote oil filter relocation, and oil pressure gauge plumbing. The 7.3/10 score reflects that street cars operate in a narrower pressure and temperature band than dedicated race hardware, but the consequence of a failure is identical — instant oil loss and engine destruction. A correct AN-spec kit is always worth the incremental cost over generic hose and hardware on any pressurized oil circuit.

Overlanding / Expedition — 7.1/10

Remote and expedition use cases demand oil line hardware that handles temperature extremes from below freezing to sustained desert heat, constant chassis flex, and no access to replacement parts in the field. Expedition-spec fitting kits use corrosion-resistant materials and vibration-rated thread-locking geometry — the kind of detail that matters when a fitting works loose on a corrugated track 150 miles from pavement.

Trusted Oil Line Kits Brands We Carry

The brands that earn shelf space in serious performance shops are there because of engineering standards, not marketing. Vibrant has built a reputation on consistent PTFE-lined hose construction and a fitting catalog wide enough to cover virtually any AN, NPT, or metric routing scenario. Fragola brings motorsport-heritage line assembly with swaged end fittings that meet or exceed PTFE hose burst standards used in professional road racing. Radium Engineering focuses on complete system solutions — their fuel and oil line kits are engineered as matched assemblies, not mix-and-match hardware. Russell built its catalog on the entry point for braided oil and fuel line, offering correctly rated hose and fittings at accessible price points that still meet real performance requirements. ARP owns the crankcase and fastener hardware side of this equation, with alloys and heat treatment processes borrowed from aerospace and Formula-level engine programs. Aeromotive rounds out the catalog on the high-volume fuel and oil system side, particularly for belt-drive and mechanical pump applications where electric system limits have already been reached.

Frequently Asked Questions

Are 45-degree and 90-degree AN elbow fittings interchangeable?

No — they are the same thread standard and the same AN dash size, but they are not functionally interchangeable because bend angle directly affects line routing geometry and flow restriction. A 90-degree elbow creates more flow restriction than a 45-degree in the same line size, which matters in tight-clearance turbo oil drain routing where you need maximum drainage velocity. Use the shallowest bend angle the physical space allows — every unnecessary degree of bend in an oil drain line adds restriction that raises the risk of center-section flooding. The correct choice is the one that lets the line exit at a consistent downward angle without kinking.

Are aftermarket radiator hoses worth it for a performance build?

For a street car running stock coolant temperatures, factory-spec rubber hoses are adequate — they're engineered for the application and replacement cost is low. Where aftermarket silicone hoses earn their cost is in sustained high-coolant-temperature environments: forced induction builds, track cars that spend extended time at operating temperature, or any application where underhood heat cycles are extreme. Silicone holds its shape under vacuum and pressure collapse over a much wider temperature range than EPDM rubber, and it won't degrade from oil contamination the way rubber does. Budget silicone kits from unknown brands can be worse than OE rubber — stick to brands with documented wall-thickness specifications and burst pressure ratings. Check out our cooling category for matched hose and hardware options.

Are aftermarket radiators any good, and do they actually perform better?

A quality aftermarket aluminum radiator with a higher core thickness or denser fin count will outperform a factory radiator that has 50,000 miles of scale buildup and electrochemical corrosion reducing flow capacity — but a new OE radiator in a stock application is hard to beat on pure engineering terms. Where aftermarket units justify the cost is when you've increased heat rejection requirements through forced induction, higher compression, or extended WOT operation that the OEM cooling system wasn't designed for. Two-row and three-row aluminum cores with brazed construction handle higher coolant velocity without the internal restriction that clogs aged plastic-tank OE units. Always verify the inlet and outlet diameters match your plumbing before purchasing — even a correctly sized core is useless if the tank fittings require fabricated adapters.

Are all brake line fittings the same?

No — brake line fittings use several distinct thread and flare standards that are not cross-compatible and must be matched correctly to avoid a catastrophic sealing failure. The most common standards in performance applications are SAE 45-degree double-flare, ISO bubble flare (common on European OE systems), and AN/JIC 37-degree single flare used on braided stainless brake line kits. Mixing flare angles produces a mechanically weak joint that may hold pressure briefly but will fail under pedal-induced pressure spikes. Thread pitch also varies — 3/8"-24 UNF, 10mm x 1.0, and 10mm x 1.25 are all in common use and won't cross-thread obviously during assembly. Always identify your existing fitting standard before purchasing replacement or upgrade hardware; if you're building a complete braided brake line kit, confirm the caliper and master cylinder inlet threads before specifying fittings. Browse our fittings category for the full range of AN and metric brake line hardware.

Are Aeroflow fittings good quality for pressurized oil circuits?

Aeroflow fittings are a respected mid-tier brand that originated in Australian motorsport and produce aluminum and stainless AN fittings that meet consistent dimensional tolerances for street and club-level competition use. Their aluminum body fittings are correctly specced for oil and fuel line applications where temperatures stay below 250°F sustained — beyond that, stainless bodies are the appropriate choice. Aeroflow's documented burst pressure ratings are in line with comparable fittings from Fragola and Russell at similar price points, which makes them a legitimate option for PTFE-lined hose assemblies. As with any fitting brand, verify that the ferrule and body are matched to the specific hose construction — using a smooth-bore fitting body on PTFE liner hose, regardless of brand, will not produce a reliable seal under pressure cycling.

Building something specific? Our performance specialists can help you select the right Oil Line Kits for your application — street, track, or full race build.