OTK 5W30 20W50 mix
gretchengehrke | 3 spectra | 1
Oil Testing Kit; 5W30 neat, 20W50 neat; 1:1 mixture
gretchengehrke | 3 spectra | 1
Oil Testing Kit; 5W30 neat, 20W50 neat; 1:1 mixture
gretchengehrke | 3 spectra | 3
Oil Testing Kit, 5W30 and 20W50 and "unknown"; spectra smoothed and calibrated by white bike light.
