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Best Overall Result
Only additive to tie the control oil overall
Purchased for: $11
Made In: Germany
MoS2-based anti-friction engine treatment. One can treats up to 6.4 quarts of motor oil. The creator concluded that Liqui Moly was the only additive that tied the straight motor oil in the overall ranking.
Liqui Moly stayed closest to the straight motor oil across the creator's overall ranking and also had the lowest evaporation loss.
Best Wear Result
4.70 mm heat-conditioned wear scar
Purchased for: $25
Made In: USA
Engine treatment marketed with nano-diamond technology. It delivered the smallest heat-conditioned blended-oil wear scar among the tested additives, but it also increased evaporation loss and reduced observed fuel economy.
Bestline was the only properly mixed, heat-conditioned additive blend to beat the 5.37 mm control-oil wear scar.
Best Short-Term MPG Gain
+1.48 MPG in its vehicle test
Purchased for: $39
Made In: USA
Oil treatment used at 1 ounce per quart in the vehicle test. It showed short-term fuel-economy and acceleration gains, but heat exposure substantially worsened its later cold-flow and wear-test performance.
ProLube improved observed fuel economy from 21.92 to 23.40 MPG and improved 0-60 time by 0.15 second, but later heat testing raised durability concerns.