do you use Opti-Lube XPD with every fill-up? also...what's the going price of it and where did you purchase from? thanks...MERRY CHRISTMAS!!!I've been trying a gallon of Opti-Lube XPD - seems ok so far. I might try Standine next (just to see) I have been adding Amsoil Cold Flow Improver when the weather wants to get below zero though.
You are paying way too much for Stanadyne. Ordering online, and paying shipping, it costs me about 5 cents to treat a gallon of fuel.Standyne and Howes are both approved by GM as per my dealer. I saw the biggest difference with the Stanadyne, but at 24 bucks a bottle, that only treats two tanks, it's not cost effective. Howes however is.