since we've had this really cold weather the past few weeks I've read on here that some are having problems with their fuel gelling and others saying they never add any anti gel and never had problems. then I read if you over treat its not good either. I've had a diesel for the past 17 years and never added a treatment for gelling until it gets down around 0 F. at that point I usually add some each time I fill up. I've used Ford's treatment, polar power and a few others. I always thought the rate on the bottle was just a guideline and the colder it gets the more you can/need to add. I know some I've used say you can go up to double that rate. I also assume the farther north you live, say Canada, the more treatment is added to the fuel at the pumps. I just wondered if most on here add any additional anti gel when they fill their tanks and at what temp. they start to add.