Homelite CSP3816 Operator's Manual page 8

Petrol
Oil
Mix Petrol and Oil
SAVE THESE INSTRUCTIONS
SYMBOLS
Use unleaded petrol intended for motor vehicle use
with an octane rating of 87 [R + M] / 2) or higher.
Use 2-cycle oil for air-cooled engines.
Mix the fuel mix thoroughly and also each time
before refuelling.
UK - Page 8