Oil Analysis - Driven GP-1
The first 2 oil changes I did on my ZR-1 were with Mobil 1 high mileage. I knew the ZDDP content of the oil wasn't what it used to be, so I started looking for an alternative. I spoke with Driven Racing Oils and was pointed towards their GP-1 line. They don't advertise specific ZDDP content, but claim:
"...A high zinc (ZDDP) content that has been engineered and tested to deliver increased horsepower and engine wear protection under high load....Pennsylvania grade base oil compounded with select synthetic components provide a higher Pressure-Viscosity Coefficient for excellent High Temperature-High Shear (HTHS) stability for increased film thickness, combined with Driven's ZDDP additive package GP-1 delivers a synergetic chemical balance producing enhanced wear protection."
Lots of marketing talk. I just wanted increased ZDDP content, but not too high to be catalyst unsafe. I've been using it the last 3 years and finally decided to to an oil analysis through Blackstone Labs. These were the results on 10w-30.
Phosphorus = 1078 ppm
Zinc = 1192 ppm
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