Best Power Steering Fluid for GM Trucks (2026)

Steering that groans on a cold morning or goes vague at parking speed usually points at the fluid: the wrong spec, a tired fill or a low reservoir. The best power steering fluid for gm trucks is the one that meets the GM specification your truck calls for, stays stable in cold and heat, and keeps seals pliable. This guide compares the fluids by GM fit, synthetic base, cold flow, seal care and warranty.

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Picks for the garage

#	Product	Shop Score	Buy
1	Valvoline Power Steering Fluid	9.7/10	Buy on Amazon
2	TRIAX U.S. Car PSF - Full Synthetic Power Steering	9.7/10	Buy on Amazon
3	Lubegard 23201 Complete Synthetic Power Steering	9.7/10	Buy on Amazon
4	STP Power Steering Fluid	9.5/10	Buy on Amazon
5	TRIAX Asian Car PSF Hydraulic & Electric Full	9.5/10	Buy on Amazon

1

Valvoline Power Steering Fluid

Valvoline·9.7/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 32 fl oz bottle that meets GM 1050017, plus Chrysler 5931 and Ford M2C195-A. It maintains performance and condition, prevents squealing and inhibits wear and oxidation, and it carries a 1 year manufacturer warranty.

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Pros

• Meets GM 1050017, the GM specification named in the listing
• Prevents squealing and inhibits wear and oxidation
• A 1 year manufacturer warranty, the only stated term here
• Amber fluid in a 32 fl oz bottle for a top-up

Cons

• The listing does not state a synthetic base
• No cold-flow figure is stated
• The 32 fl oz bottle is small for a flush
• No seal conditioner is named in the listing

2

TRIAX U.S. Car PSF - Full Synthetic Power Steering

Triax·9.7/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A full synthetic quart built for US vehicles: GM, Ford, Chevrolet, Cadillac, Buick, GMC, Chrysler, Dodge, Jeep and Ram. It covers hydraulic and electro-hydraulic systems, works where ATF +4 or Dexron III ATF is specified, and keeps flowing to -40F.

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Pros

• Full synthetic, built for US vehicles including GM, GMC and Chevrolet
• Covers hydraulic and electro-hydraulic power steering systems
• Works where ATF +4 or Dexron III ATF is specified
• Crisp steering response to -40F cold operation

Cons

• No warranty term is stated
• A 1 quart bottle, small for a flush
• No GM specification number is named, only suitability
• A general US-vehicle fluid, not a GM-only formula

3

Lubegard 23201 Complete Synthetic Power Steering

Lubegard·9.7/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 1 gallon bottle of complete synthetic fluid for all European, North American and Asian vehicles, compatible with E-PSF. It reduces friction, protects seals and hoses and performs in cold and high temperature.

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Pros

• A full gallon, the largest bottle here
• Covers all European, North American and Asian vehicles
• Compatible with E-PSF
• Reduces friction and protects seals and hoses

Cons

• No warranty term is stated
• No GM specification number is named
• At 7.0 pounds it is the heaviest bottle here
• No cold-flow temperature is stated, only cold and high temperature performance

4

STP Power Steering Fluid

STP·9.5/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 32 fl oz bottle designed for power steering units, protecting against wear and pump breakdown caused by abnormal wear, oxidation and foaming, and performing even in sub-zero treatment.

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Pros

• Designed for power steering units in cars and trucks
• Protects against wear and pump breakdown
• Performs even in sub-zero treatment
• A 32 fl oz bottle for a top-up

Cons

• No warranty term is stated
• No GM specification or GM fit is named
• No synthetic base is stated
• No seal care is named

5

TRIAX Asian Car PSF Hydraulic & Electric Full

Triax·9.5/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A full synthetic quart for Asian vehicles: Honda, Acura, Toyota, Lexus, Nissan, Infiniti, Mazda, Hyundai and Kia. It delivers consistent flow and pump performance for up to 250,000 miles, with seal protection and winter use down to -50°F.

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Pros

• Full synthetic with a very low pour point
• Winter use down to -50°F
• Consistent flow and pump performance for up to 250,000 miles
• Seal elastomer additive keeps seals pliable

Cons

• Built for Asian vehicles only, not for GM trucks
• No warranty term is stated; the listing says per specification
• No GM specification or GM fit is named
• The listing names no ATF specification

Compared on paper

Specs such as CFM, PSI and torque are the manufacturer’s ratings as listed, collected 11 November 2026.

How the points were given

Each fluid is scored on performance, build, value, safety and warranty, with the weights published on the How We Pick page. A stated GM specification earns full performance points; a synthetic base and stated cold-flow figures add to build. No listing states a safety certification, so safety is 0 for every pick.

Shop Scores range from a low of 9.2 to a high of 9.8, with each tool positioned by its weighted points proportionally, and more points always yields a higher score. Where a tool neither runs on power nor lists a safety feature, safety shows n/a and the other 90 points decide.

What the listings tell you

The 5 listings here state a mix of GM fit, synthetic base and cold flow. Only 1 names a GM specification: the Valvoline meets GM 1050017, plus Chrysler 5931 and Ford M2C195-A. The TRIAX U.S. Car PSF says it is suitable for GM, Ford, Chevrolet, Cadillac, Buick and GMC, but names no GM specification number. The TRIAX Asian Car PSF covers Asian vehicles only, so it is the wrong fit for a GM truck. Only 1 listing states a warranty term: the Valvoline carries a 1 year manufacturer warranty. The TRIAX Asian listing says per specification, which is not a term. Cold flow is stated by 3 listings: the TRIAX U.S. Car PSF to -40F, the TRIAX Asian Car PSF down to -50°F, and the STP in sub-zero treatment. The Lubegard states excellent cold and high temperature performance with no temperature figure.

Buying guide: best power steering fluid for gm trucks

GM spec first

Start with the specification your truck calls for. The Valvoline meets GM 1050017, the only GM specification number named in these listings. The TRIAX U.S. Car PSF says it is suitable for GM, Ford, Chevrolet, Cadillac, Buick and GMC, which is a fit claim, not a specification number. The TRIAX Asian Car PSF names Asian makes only. Match the bottle to your truck’s spec before you buy.

Synthetic base and cold flow

3 of the 5 listings state a synthetic base: the TRIAX U.S. Car PSF and the TRIAX Asian Car PSF are full synthetic, and the Lubegard is synthetic. The Valvoline and the STP state no base. For cold mornings, the TRIAX U.S. Car PSF lists crisp steering response to -40F and the TRIAX Asian Car PSF lists winter use down to -50°F. The STP performs even in sub-zero treatment, and the Lubegard states excellent cold and high temperature performance.

Size: 32 fl oz, 1 quart or 1 gallon

The Valvoline and the STP come in 32 fl oz bottles, the TRIAX U.S. Car PSF and the TRIAX Asian Car PSF in 1 quart bottles, and the Lubegard in a 1 gallon bottle. A 32 fl oz bottle suits a top-up; a 1 gallon bottle suits a shop shelf or a flush. Pick the size that matches the job, not the biggest bottle by default.

Seal care and warranty

Seal conditioners keep O-rings and seals pliable: the TRIAX U.S. Car PSF names seal conditioners, the TRIAX Asian Car PSF names a seal elastomer additive, and the Lubegard protects seals and hoses. Only 1 listing states a warranty term: the Valvoline carries a 1 year manufacturer warranty. The TRIAX Asian listing says per specification, which is not a term, and the other 3 listings state no warranty at all.

For a GM truck, the Valvoline leads on the GM specification and the warranty, and the TRIAX U.S. Car PSF is the strongest synthetic pick for cold weather. If a leak is the problem, see a power steering fluid leak stop and an oil extractor pump for transmission fluid for draining the old fill.

FAQ: garage tools

How much power steering fluid is needed?

The listings here come in 32 fl oz, 1 quart and 1 gallon sizes, and no listing states a fill volume for a truck. How much your truck needs depends on the reservoir and whether you are topping up or flushing, so check the reservoir level and the owner’s manual for your truck.

Does electric power steering use fluid?

Pure electric steering uses no fluid. Electro-hydraulic systems do: the TRIAX U.S. Car PSF covers hydraulic and electro-hydraulic systems, and the Lubegard is compatible with E-PSF. Check whether your truck has hydraulic, electro-hydraulic or pure electric steering before you buy fluid.

How much power steering fluid for a flush?

No listing here states a flush volume. A flush uses more than a top-up, so a 1 gallon bottle like the Lubegard covers more than a 32 fl oz or 1 quart bottle. Check the service manual for your truck and drain the old fill before you refill.

How hot does power steering fluid get?

No listing here states a temperature. The Lubegard states excellent cold and high temperature performance, and the TRIAX U.S. Car PSF says it resists thinning and oxidation under summer heat and high-load parking maneuvers. Pick a fluid that states high temperature performance for a truck that works hard.

When to top up power steering fluid?

Top up when the reservoir level is low. The Valvoline listing says it prevents squealing, which is one sign the fluid needs attention, and the TRIAX U.S. Car PSF helps reduce pump whine, groan and steering shudder. Check the reservoir level and top up with a fluid that meets your truck’s specification.

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