Normally, the lubricating oils preferred will be {HEAD ~ fluid oils}, ranging in viscosity of about 40 Saybolt universal seconds at 100° Fahrenheit to {TAIL ~ about 200 Saybolt universal seconds} at 210° Fahrenheit 
Normally , the lubricating oils preferred will be { HEAD ~ fluid oils } , ranging in viscosity of about 40 Saybolt universal seconds at 100 ° Fahrenheit to { TAIL ~ about 200 Saybolt universal seconds } at 210 ° Fahrenheit
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH