Best STP Products
The top-scoring STP products in our catalog, ranked by CarCareTruth's independent CCT score. 4 STP products scored. No paid placements; rankings update as scores change.
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Top 4 STP products by overall score
Complete Fuel System Cleaner
CCT 5.8/10Health 4.0/10
Ultra 5 in 1 Fuel System Cleaner
CCT 5.7/10Health 4.0/10
Super Concentrated Fuel Injector Cleaner
CCT 5.2/10Health 4.0/10
Pro Series Intake Valve Cleaner
CCT 4.9/10Health 3.1/10
Safest STP products by health score
Ranked by ingredient-chemistry health score, not overall CCT. Useful when low-VOC, low-asthmagen, or PFAS-free formulations matter more than peak performance.
Complete Fuel System Cleaner
CCT 5.8/10Health 4.0/10Super Concentrated Fuel Injector Cleaner
CCT 5.2/10Health 4.0/10Ultra 5 in 1 Fuel System Cleaner
CCT 5.7/10Health 4.0/10