Is store-brand synthetic oil as good as Mobil 1?

For most cars, yes. Any full synthetic that meets your owner's manual spec, usually API SP or dexos1, has passed the same industry tests, so Amazon Basics, SuperTech and Kirkland protect your engine essentially as well as Mobil 1 or Castrol at normal drain intervals. Premium brands can have slightly stronger additive packages that matter for extended drains, towing or high performance, but for ordinary driving you are largely paying for the name.

Is conventional oil cheaper than synthetic?

Per change, yes, but not per year. Conventional oil is cheaper a jug but needs replacing about every 3,000 miles versus 7,500 or more for full synthetic, so you buy it twice as often. Once you count the extra changes and the extra filters, the saving mostly disappears, and synthetic protects better, especially in heat and cold. For nearly all modern cars, full synthetic is the better value.

Which synthetic oil is the best value?

The cheapest full synthetic that meets your car's spec. Store brands like SuperTech and Kirkland are cheapest at about 26 dollars a change but are not sold online; among brands you can order, Amazon Basics and Quaker State full synthetic are the value picks at around 30 to 32 dollars a change. Buy premium only if your manual demands a specific approval, like a European VW or BMW spec, or you run extended drain intervals.

A DIY oil change is $30. The shop charges $90.

Q: How much does a DIY oil change cost vs a shop?

A do-it-yourself full synthetic oil change costs about 30 dollars: roughly 22 for a 5-quart jug and 8 for a filter. A shop charges 80 to 100 dollars for the same full synthetic change, so most of what you pay them is labour and markup. At three changes a year, doing it yourself saves around 180 dollars a year, and it takes about 20 minutes once you have a drain pan and a wrench.

A full synthetic oil change is about 22 dollars of oil and 8 of filter, and takes twenty minutes. A shop charges 80 to 100 for the same thing. On top of that, every full synthetic that meets your car's spec protects almost identically, so the premium brands are mostly marketing. Here is every option ranked by real cost per change, and how much doing it yourself saves.

Prices reviewed 31 July 2026 . Cost per change is a 5-quart jug plus a typical filter, in USD; your car's oil capacity and filter vary. Always follow your owner's manual spec. Not mechanical advice.

usefulHQ Study · 2026

Doing your own oil change saves about $180 a year and premium oil brands are mostly markup

We costed 13 full synthetic oils by the real DIY cost per change, a 5-quart jug plus a filter. The cheapest on Amazon Amazon Basics is $30; premium Mobil 1 is $38 and extended-drain Amsoil $58. All meet the same API SP or dexos spec, so for normal driving they protect alike. A shop charges $80 to $100 for the identical change.

Cheapest DIY change

$30

jug + filter, full synthetic

Typical shop change

$90

same oil, plus labour

Saved / year, DIY

$180

at 3 changes a year

Average DIY cost per change by oil tier

Method: cost per change is a 5-quart jug of full synthetic plus a typical ~$8 filter, the DIY cost. Every oil here meets modern API SP or dexos specs, so they protect similarly at normal drain intervals; premium brands cost more for additives and marketing. Store brands (Walmart SuperTech, Costco Kirkland) run ~$26 a change but are not sold on Amazon. Cost per year assumes the changes you set. Prices are indicative USD. Cite this: "usefulHQ Oil Change Cost Study 2026", usefulhq.com/oil-change-cost/.

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Oil changes per year

/ yr

Over how many years

years

Most cars need a full synthetic change every 7,500 miles or so, about 2 to 3 times a year. Doing it yourself is where the money is.

Show only

Motor oil (full synthetic)	Tier	Per change	Cost / year	Total over term	Best for
Amazon Basics Full SyntheticBest value Meets API SP; the same protection as premium for most cars, at Amazon's lowest price.	Value	$30	$90	$270	Cheapest on Amazon	Check price
Pennzoil High Mileage Full Synthetic Full synthetic with seal conditioners for 75k+ mile engines, at a low price.	Value	$31	$93	$279	For older engines	Check price
Quaker State Full Synthetic A Shell-owned full synthetic meeting modern specs at a low cost per change.	Value	$32	$96	$288	No-frills value	Check price
Castrol GTX Full Synthetic A trusted full synthetic meeting the same specs for a dollar or two less.	Mainstream	$34	$102	$306	Undercuts Mobil 1	Check price
Valvoline Advanced Full Synthetic A well-regarded full synthetic; solid, but you pay for the name.	Mainstream	$36	$108	$324	Popular mainstream	Check price
Pennzoil Platinum Made from natural gas for a clean base oil, at a mainstream price.	Mainstream	$36	$108	$324	Gas-to-liquid base	Check price
Mobil 1 Extended Performance The default premium; excellent, but meets the same API spec as cheaper oils.	Mainstream	$38	$114	$342	The best-seller	Check price
Castrol Edge Titanium-additive marketing; a fine oil at a premium mainstream price.	Mainstream	$38	$114	$342	Marketed for strength	Check price
Valvoline Restore & Protect A newer oil marketed to remove deposits; a premium price for the claim.	Premium	$41	$123	$369	Cleans deposits	Check price
Royal Purple HPS High-performance additives loved by enthusiasts, at a dear price per change.	Premium	$45	$135	$405	Enthusiast favourite	Check price
Mobil 1 Annual Protection Marketed for once-a-year changes; premium price, longer interval.	Premium	$46	$138	$414	20k-mile drain	Check price
Liqui Moly (Euro specs) Meets strict VW, BMW and Mercedes specs; needed for some Euro cars, priciest mainstream.	Specialty	$53	$159	$477	European cars	Check price
Amsoil Signature Series A top-tier extended-drain synthetic; genuinely long intervals, at the top price.	Specialty	$58	$174	$522	25k-mile drain	Check price

How this works. Per change is a 5-quart jug of full synthetic plus a typical ~$8 filter, the cost of doing it yourself. The key fact: every oil here meets your car's modern API SP or dexos spec, meaning it has passed the same industry protection tests, so for ordinary driving a $30 store-brand full synthetic guards your engine essentially as well as a $58 premium one. Pay up only if your manual demands a specific approval, such as a European VW or BMW spec, or you run extended drain intervals where a top-tier oil like Amsoil genuinely lasts longer. Two more truths: a shop charges $80 to $100 for the exact same change, so DIY is the real saving; and conventional oil is cheaper per jug but needs twice the changes, so it rarely saves money and protects less. Prices are indicative, and your car's oil capacity may differ from 5 quarts.

Common questions

How much does a DIY oil change cost vs a shop?

About $30 DIY (a 5-quart jug ~$22 plus an $8 filter) versus $80 to $100 at a shop for the same full synthetic. At three changes a year, DIY saves around $180 a year and takes about 20 minutes.

Is store-brand synthetic as good as Mobil 1?

For most cars, yes. Any full synthetic meeting your spec (usually API SP or dexos1) has passed the same tests, so Amazon Basics, SuperTech and Kirkland protect essentially as well at normal intervals. Premium matters mainly for extended drains, towing or specific European approvals.

Is conventional oil cheaper?

Per change yes, per year no. Conventional needs replacing about every 3,000 miles versus 7,500+ for synthetic, so you buy it twice as often. The saving mostly vanishes and synthetic protects better. Full synthetic is the better value for nearly all modern cars.

Which synthetic oil is best value?

The cheapest full synthetic that meets your spec. Store brands (SuperTech, Kirkland) are cheapest at ~$26 a change but not sold online; among orderable brands, Amazon Basics and Quaker State full synthetic are the value picks at ~$30 to $32.