HOMELITE has had 3 different oils they have recommended. The old 16:1 has been discontinued and replaced by the 32:1 and EXACTMIX 50:1 in the squeeze-up bottle.
Either would work, but you have to be more careful of the exact amount with the higher ratio mix as any error is almost double = Trouble.
IF your trimmer is running OK, don't change
To avoid having old stale fuel mix, make the smallest amount you will use in less than a month.
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I am a current oldtime HOMELITE dealer with an extensive inventory of NEW, NOS & USED parts.
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Bill Walcott
Brauchi Bros Inc-almost 50 yrs with HOMELITE
700 N 12th
Marysville KS 66508 USA
785-562-3539