The weekly rhythm you have to test around
Crude has a scheduled inventory report mid-week that regularly produces the largest single candle of the week. That is not noise to be excluded — it is a structural feature of the instrument, and how your strategy behaves across it is part of the strategy whether you planned for it or not.
Log it explicitly: mark which trades were open across a release and split your results on that column. Traders routinely discover that their oil edge is real on ordinary days and entirely erased by two or three release candles a month — which is a fixable problem, but only once it's visible.
Oil trends, and why breakout rules were built on it
Commodities like crude are where trend-following systems earned their reputation: persistent directional moves driven by supply and inventory rather than by sentiment alone. That makes it the natural instrument to test a Donchian channel breakout or a Supertrend on — the classic rules, on the classic market.
It is also unusually punishing for tight stops. Crude's average candle range relative to a typical retail stop is large, so backtest with realistic stop distances from the start, sized through the position size calculator.
Running the test
Open USOIL and step forward candle by candle. The whole archive is open on the first chart, which for crude is the difference between sampling a handful of inventory releases and testing across genuine supply shocks. Nothing is gated; you spend candles as you advance them, and the first 10,000 are free.
Frequently asked questions
Is this WTI or Brent?
WTI — the CL contract. It's the more actively traded of the two for intraday work and the one most retail platforms quote as "USOIL".
Can I backtest oil for free?
CRTLAB is free to try. You get WTI crude across the full archive, with every tool the product has, for your first 10,000 candles of replay — roughly two hours of stepping through a chart, no card needed. After the sample, unlimited replay is $14.99 a month, cancel any time. The Wednesday inventory release is in the data, which is the single event most crude intraday rules need stress-testing against.
How should I handle inventory release days in a backtest?
Log them as a column rather than excluding them. Excluding them produces a strategy you can't actually trade, because the releases happen whether your backtest included them or not — the useful output is knowing what they cost you.
What timeframe works for crude?
Crude's trends are visible on the hourly and above, and its intraday noise is substantial, so most people find the higher timeframes cleaner. Test both — the engine is identical on every timeframe from 1 minute to weekly.