McCulloch Fuel Ratio's

Gasoline                                       40-1  ratio                                     20-1 ratio
                                                 Custom Lubricant                     SAE 40 2 Cycle oil
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1/2 US Gal ............................1.6 oz or 48ml (cc)                     3.2 oz or 95 ml (cc)
1    US Gal ............................3.2 oz or 95ml ..........................6.4 oz or 190 ml
5    US Gal .............................16 oz or 475 ml ......................32.0 oz or 950 ml

1 Litre .....................................0.9 oz or 25ml .........................1.7 oz or 50 ml
5 litre ......................................4.3 oz or 125ml .......................8.5 oz or 250 ml
20 litre ..................................17.0 oz or 500ml ..................34.0 oz or 1000 ml

1 Imp Gal ...............................4.3 oz or 125ml ..........................8.6 oz or 250ml
2 Imp Gal ...............................8.6 oz or 250ml .........................17.1 oz or 500ml
5 Imp Gal .............................21.4 oz or 625ml .........................42.8 oz or 1250ml

Mixing procedure                        40 parts gasoline to             20 parts gasoline to
                                                        1 part lubricant                    1 part lubricant

1ml =1 cc
McCulloch also used a fuel ratio of 32-1 in their Hi-Performance chainsaws like the
SP81, PM850.