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Old 05-26-2017, 10:51 AM   #5 (permalink)
101Volts
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Join Date: Dec 2012
Location: Pennsylvania
Posts: 491

Grandpa's Caprice (retired) - '84 Chevrolet Caprice Classic
Last 3: 20.76 mpg (US)

Woody - '90 Mercury Grand Marquis Wagon LS
Last 3: 19.57 mpg (US)

F.E. Brick - '99 Chevrolet K2500 Suburban LS
Last 3: 12.94 mpg (US)

Mom's Car - '01 Chevrolet Impala Base
90 day: 21.95 mpg (US)

R.J. - '05 Ford Explorer 4wd
90 day: 19.52 mpg (US)
Thanks: 876
Thanked 33 Times in 27 Posts
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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