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5w30 conventional motor oil

Skip it48/100

a small market ($79K/yr) — 5w30 conventional motor oil doesn't clear our bar today.

Market/yr

$79K

Growth (1y)

+205.8%

Products

32

Brands

8

was 7 a year ago

Sellers

117

Price range

$6.37–$78.81

Returns

0.5%

Rating

4.8★

48/100

Skip it

Scored 48/100 across market size, growth, competition, quality gap, and returns.

Market sizeGrowthCompetitionQuality gapReturns
Market size
4
×0.30
Growth
77
×0.30
Competition
59
×0.20
Quality gap
20
×0.10
Returns
96
×0.10

Demand

Weekly Amazon search volume, last 48 weeks — +205.8% year over year.
3K2KSpike '26Aug '25Oct '25Nov '25Jan '26Mar '26May '26

Competition

27%Quaker State
  • Quaker State27%
  • Castrol24%
  • Valvoline23%
  • Pennzoil17%
  • Barnesmith5%
  • Motorcraft1%
  • Other (2 brands)2%

The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them. 8 brands and 117 sellers compete here.

Brands

8 rising

was 7 a year ago

Sellers

117

Top 5 brand share

96%

#ProductBrandPriceRatingReviewsClick shareTrend
2Quaker State$63.874.6★14914%falling
5Castrol$20.814.8★4,4175%falling
7Castrol$19.644.8★2,8085%falling
8Pennzoil$6.374.8★2,6074%rising
9Quaker State$78.814.7★1,0363%rising
13Pennzoil$36.844.8★2,6072%rising
15Quaker State$36.084.7★1,0362%falling

Product shelf

Reviews

What buyers praise and complain about, mined from review topics.

What buyers love

Value For Money39%

“Excellent value”

Quality-Overall19%

“great product, as advertised”

Lubrication16%

“Best oil”

Advertised Vs Actual Product8%

“As advertised”

Fuel Efficiency3%

“good motor oil for high mileage vehicles”

Efficiency2%

“works well”

Ease Of Use2%

“Easy to use”

Motor Power2%

“Functions great and my engine to feels smooth”

Leak-Proof1%

“clean no damage no leaks”

Size-Overall1%

“Perfect fit for OEM”

What buyers complain about

Leak-Proof37%

“arrived leaking”

Lubrication9%

“Oil is not oil”

Motor Issues6%

“It would of blown up my engine”

Value For Money5%

“a bit pricey”

Natural Resource Wastage3%

“Waste”

Fuel Efficiency3%

“my car's engine failed”

Filtration3%

“until your boyfriend forgets to tighten the oil filter”

Material Quality3%

“Not full synthetic”

Weight Heavy3%

“Oil weight”

Ease Of Use3%

“Took a little to get use to box”

Top return reasons

  • Leak-Proof25%
  • Compatibility-Overall20%
  • Lubrication12%
  • Value For Money11%
  • Advertised Vs Actual Product9%
  • Material Quality5%
  • Motor Issues3%
  • Size-Overall3%
  • Defective Material/Parts3%
  • Certifications2%

Data scraped July 9, 2026 · Marketplace baseline: 4.4★ avg rating · $22.71 median price · 2.2% median returns across 13,812 tracked niches.