The double supply shock — US-Iran fighting threatening tankers near Iran's main oil island, and Ukrainian strikes knocking out Russian refining capacity — has created what reporters are calling a diesel crisis heading into peak demand season. Refiners lik

Verdict: A diesel-margin story the numbers confirm — but a trade the tape says to wait on

This is a thesis the numbers already endorse, but a trade the tape says not to touch today. The fundamentals leg is the strongest point for: in the June 2026 quarter MPC's net income jumped from $511M to $5.14B and VLO's rose 194% to $3.72B, exactly the crack-spread signature the idea predicts from the diesel supply squeeze (per the idea's thesis, echoed by the Bloomberg and Reuters items on Iran and Ukraine). The strongest point against is timing: all three names press their range highs with 14-day RSI above 70 (DINO 76.0, MPC 83.7, VLO 81.1), so the strategy's own overbought exit condition is already lit and the entry — a close below the lower Bollinger band near $96 DINO, $363 MPC, or $347 VLO plus a stochastic crossover — requires a 6% to 9% flush that hasn't come. Filed disclosures add caution: net open-market insider selling at MPC (about $4.0M) and VLO (about $5.7M). No robust parameter setup was established for the rules, and the entry never fired across 1,236 daily bars, so this is a watch-list, not a signal. What would flip the verdict: a hot CPI print reinforcing the energy-hedge leg, or a sharp pullback closing below a lower band with the stochastic crossover — either would move this from waiting to actionable.

Trade now: waiting for the pullback, not chasing strength

Do nothing today. This is a dip-buying strategy, and all three names are at the opposite extreme. DINO closed at $105.41, about 9.2% above its lower Bollinger band ($96.22); MPC at $388.90, about 6.7% above its band ($362.86); and VLO at $370.72, about 6.3% above its band ($347.27). The entry requires a close below the lower band alongside a stochastic crossover off a stretched condition, and none of that is close to being in range — each name is pressing its range high rather than testing the lower band. Note that no robust parameter setup was established for tuning these thresholds, so the rules stand as written. What "wait" means concretely: watch for a sharp single-session or multi-session drop that pushes a close below the band levels above — roughly $96 on DINO, $363 on MPC, or $347 on VLO — paired with the fast stochastic line crossing back above its signal line. Only then does the setup arm. Position sizing is fixed-risk at 2.24% of the account per trade, capped at 25% per position, so there is no reason to pre-position ahead of the trigger. If an entry does fire, the exit rules are already defined: a hard stop at a 2.2% loss (plus a structure stop at the rank-2 support level), a take-profit at a 4.5% gain or the first resistance level, and an overbought exit when the 14-day RSI moves above 70. That gives roughly 2:1 effective reward-to-risk on the fixed brackets. Notably, the RSI-overbought exit condition is already met on all three names (DINO at 76.0, MPC at 83.7, VLO at 81.1) — the mirror image of the entry state. That confirms the setup is in its waiting phase, not a trust problem: the rules describe a dip-buy, and there has been no dip.

The diesel margin shock is already in the P&L

The macro thesis is not hypothetical anymore — it is already showing up in the reported numbers. In the quarter ended June 30, 2026, Marathon Petroleum's net income jumped from $511M to $5.14B, operating cash flow from $1.12B to $10.33B, and free cash flow from $208M to $9.14B, while gross margin nearly doubled to 17.2%. Valero delivered the same pattern the same quarter: net income up 194% to $3.72B, operating margin rising from 5.3% to 11.7%, and revenue up 37% to $44.5B. If a diesel crisis were fattening crack spreads, this is precisely what the income statements would look like, and it validates the idea's core claim that this is a margin story, not just an oil-price story.

Great thesis, no trigger, and insiders are selling

The bear case starts with what is not in the file: the entry conditions for this idea have not occurred in the evaluated window. The rules were run on real daily bars across three windows — 1236 bars over 60 months, plus 24- and 12-month cuts — and produced zero entries, so this is a watch-list setup, not an active signal. The research author did request an expanded bounded optimization after zero triggers, but no robust parameter setup was established;…

Scores

• Conviction score breakdown: 49
• Thesis support: 80
• Trade readiness: 25
• Risk quality: 45
• Trigger proximity: 10
• Fundamentals trend: 85

Watch items

• DINO — Close vs lower Bollinger band (20)
• MPC — Close vs lower Bollinger band (20)
• VLO — Close vs lower Bollinger band (20)
• DINO — Stochastic (14) vs Stochastic (3)
• MPC — Stochastic (14) vs Stochastic (3)
• VLO — Stochastic (14) vs Stochastic (3)
• DINO — RSI (14)
• MPC — Insider open-market activity
• VLO — Insider open-market activity
• VLO — Next quarterly XBRL update (September quarter)