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.
Top 4 STP products by overall score
Ultra 5 in 1 Fuel System Cleaner
CCT 5.7/10Health 4.0/10
Complete Fuel System Cleaner
CCT 5.5/10Health 2.5/10
Pro Series Intake Valve Cleaner
CCT 4.9/10Health 3.1/10
Super Concentrated Fuel Injector Cleaner
CCT 4.8/10Health 1.5/10
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.
Ultra 5 in 1 Fuel System Cleaner
CCT 5.7/10Health 4.0/10Pro Series Intake Valve Cleaner
CCT 4.9/10Health 3.1/10Complete Fuel System Cleaner
CCT 5.5/10Health 2.5/10