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I've used Opti-Lube additives for a few hundred miles, overtreating the first tank. I now use them at these rates:
Boost: 1 oz./ 10 gallons (Max rate)
XL: 2 Oz./ 10 gallons (Max rate is 2.5; note this isn't the XPD additive mentioned above. This one's for enhancing fuel lubricity.)
The vehicle does feel like it has slightly more power, the transmission doesn't downshift as much going up hills and the engine's quieter although I'd expect some of the quietness to be attributed to the better oil filtration I now have.
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