I have a 91 camry 86000, I have changed filter at intervals and drain
> refill with mobil synthetic every year. Level correct. Last winter at
> 10f several times it would not go into gear for a few minutes. Level was
> way up.. Changed filter , filter was Clean. Is my trans worn out, is
> there an adjustment or inexpensive fix,, thanks
Mark this is a little confusing. The negine oil does not influence transmission behaviour as it has its own oil and filter (inside the trans) and uses ATF (automatic transmission fluid).
If your trans is not shifting correctly and you have not had it serviced (oil, adjustemet and a filter clean) then it most likely needs it.
Changing your engine oil once a year is a little too long as well. 6 months with low miles or more frequently with heavier service is indicated. Check your under-bonnet stickers or efer to a manual/handbook.
Jason