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Check your owner's manual for recommended intervals and oil weight for your area. You can also get a service sheet from the dealer with your VIN; they'll print one out for you. It's for all routine maintenance.

Oil goes bad after a year. Ask toyota to change it all for you (engine oil mostly)

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim