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Cheapest motor oil

As of July 24, 2026, the lowest price for motor oil on Amazon is $4.27/quart — the median is $7.19/quart across 46 tracked products. Prices re-checked continuously.

Good ≤ $6.39Median $7.19Min $4.27

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Motor oil ranked by the real cost per quart — the unit that actually matters, not the size of the pack. We do the math so you compare true value.

💚 Best value right now$4.27 / quart· ACDelcoSee it →

46 live deals · cheapest per quart first

What changed

From our own price checks — not sticker “was” prices.

Price tiers by cost per quart

TierCost per quartExample
Budget$4.27 – $6.39ACDelco GM Original Equipment 10-9327 (19432320)…
Mid-range$6.39 – $9.48Valvoline MaxLife High Mileage Full Synthetic…
Premium$9.48 – $12.79Mobil 1 0W-20 Advanced Fuel Economy Full…
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Cost per quart by brand

See our Best of 2026 picks →Cost-Per-Unit IndexUnit price calculator

Cheapest by viscosity

How to buy motor oil for less

Motor oil is priced almost identically across viscosities — the choice is your engine’s spec, and the savings are all in pack size and brand.

  • Buy the 5-quart (or larger) jug, never single quarts. Single quarts can cost 2× the per-quart price of a jug — the biggest lever in the category.
  • Match the exact grade your owner’s manual lists (e.g. 5W-20 vs 5W-30). They cost the same, so there’s no money reason to deviate — only a protection reason to follow the spec.
  • Buy the cheapest brand that carries the right API/ILSAC certification for your engine. The certification donut on the bottle matters far more than the brand name.
  • Full synthetic lasts longer between changes than conventional, which lowers your real cost per year even at a higher per-quart price.

How we rank motor oil

We take each listing’s last-seen price and divide it by the quart — the unit that actually matters here — so a big pack and a small one line up on the same scale. The cheapest per quart wins, not the biggest label or the lowest sticker price.

What we check

Cheapest isn’t always best value. For motor oil we surface the trust signal that separates the real thing from filler: API / ILSAC certified.

Frequently asked questions

How is the cheapest motor oil calculated?
We take each listing's last-seen price and divide it by the quart — the unit that actually matters here — so a big pack and a small one line up on the same scale. The cheapest cost per quart ranks first, not the biggest label or the lowest sticker price.
What is the cheapest motor oil right now?
The best value right now is ACDelco at $4.27 per quart — the lowest real cost per quart of the 46 live deals we track here.
What does cost per quart mean?
Cost per quart is a listing's price divided by its quart, so two products in different pack sizes compare on the same scale instead of by sticker price. It is the single number we rank motor oil by.
What do you check beyond price for motor oil?
Cheapest isn't always best value. For motor oil we also surface API / ILSAC certified — the trust signal that separates the real thing from filler.