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What's the best heavy duty diesel engine oil?

A commercial recommendation prompt. We size how many people ask ChatGPT this from real search demand, then run it through ChatGPT to see which websites it recommends.

Est. people asking / mo
1.5K
CPC
$0.44
Total est. value / mo
$41
Common ways people ask this (15)
  • What's the best heavy duty diesel engine oil for trucks?
  • What's the best heavy duty diesel engine oil for fleets?
  • What's the best heavy duty diesel engine oil for construction equipment?
  • What's the best heavy duty diesel engine oil for older diesel engines?
  • What's the best heavy duty diesel engine oil for newer diesel engines?
  • What's the best heavy duty diesel engine oil for high-mileage engines?
  • What's the best heavy duty diesel engine oil for cold weather?
  • What's the best heavy duty diesel engine oil for hot weather?
  • What's the best heavy duty diesel engine oil for long oil drain intervals?
  • What's the best heavy duty diesel engine oil for budget buyers?
  • What's the best synthetic heavy duty diesel engine oil?
  • What's the best conventional heavy duty diesel engine oil?
  • What's the best high-mileage heavy duty diesel engine oil?
  • What's the best heavy duty diesel engine oil for turbo diesel engines?
  • What's the best heavy duty diesel engine oil for heavy towing?

What ChatGPT actually answered

One of the 5 times we asked ChatGPT this, verbatim. The leaderboard below aggregates all 5 runs.

Websites ChatGPT recommends for this prompt

Aggregated across 5 runs (min 2/5 appearances). Estimated visits split the prompt's demand by rank. Sites matching the prompt's own brand are marked branded and excluded from the leaderboard.

RankWebsiteAppearsEst. visits / moEst. value / mo
1 shell.com 5/5 30 $13
2 mobil.com 5/5 18 $7
3 castrol.com 5/5 12 $5
4 chevronlubricants.com 5/5 8 $3
5 totalenergies.com 5/5 6 $2
6 valvolineglobal.com 4/5 5 $2
7 exxonmobil.com 4/5 3 $1
8 petronas.com 4/5 3 $1
9 fuchs.com 5/5 2 $0
10 amsoil.com 4/5 2 $0
11 quakerhoughton.com 3/5 1 $0
12 delvac.com 3/5 1 $0
13 penriteoil.com 2/5 1 $0
14 lubrizol.com 2/5 1 $0
15 petro-canada.com 2/5 0 $0
16 liqui-moly.com 2/5 0 $0
17 gulf.com 2/5 0 $0
18 rotella.com 2/5 0 $0
19 bp.com 2/5 0 $0
20 enoc.com 2/5 0 $0
How is this estimated?

ChatGPT doesn't publish prompts, so we don't show logged conversations. We measure real demand for this topic from Google search volume, scale it to ChatGPT's user base (on average about 1 ChatGPT user for every 8 Google searchers, a ratio that varies by topic), and run the prompt through ChatGPT 5 times to record which websites it recommends and in what order. Estimated visits split that demand across the recommended sites by a click-through-by-rank curve. Every number is a modeled estimate, not measured analytics. Full methodology →