They recommend 7500 on the XL-7500,not the regular AMSOIL,on it they recommend 25,000 mile change intervals.Didnt you read what I posted above,I copied it right off of the AMSOIl web site.Read it HERE! Im right your wrong,again.
Howard 1998 Silverfrost SVT #1612 June mods: 17" ADR RS Limited Limix Wheels with 215/45/17 Yokohama AVS Sports