I wish my Costco sold diesel - they sell a ton of gas and their prices are great. Costco tends to have really good quality products for the money too, I doubt their fuel is any different.
From what I can tell, the only diesel I have ever bought that was noticeably better than the rest was at a busy Sinclair station while on a road trip. My truck ran like I poured a bunch of cetane additive in it on the Sinclair fuel, purred like a kitten and got great fuel economy.
My usual strategy at home is to buy from my local cheap high volume station where I can get up to $1 a gallon off using grocery store fuel points. The fuel is 40 cetane swill, but it is fresh 40 cetane swill. I always use the "premium treatment" recommended dose of Opti Lube Summer Cetane additive which has lube for the injectors and raises the cetane about 5-7 points.
The truck runs great on the treated cheap fuel. Running the cetane additive banishes any rattling/knocking and makes it purr like it did on the untreated Sinclair fuel. Been using that cheap high volume station for most of my truck's 40K miles, have never found water in the fuel filter box and the filters don't look bad after 20K miles, but I have to treat the fuel or it will rattle like an old dump truck.
Water is the biggest threat our fuel systems face. If water does get into the high pressure pump, the engine is potentially toast from a failed injector blowing it's tip off. I dunno how effective our filter/separator box is, it should be good, but I don't wanna test it
Hey guys i searched but didn't find any pics of a Colorado with these specs. if there are any guys in here running a 3" front(spacer) 1.5" back(Block) swap bar spacer lift/level kit on your Diesel non zr2 with tire specs of 265/75/17 or 265/65.17 preferably Duratrac tires just few questions...
I've got a 2017 Chevy Colorado Duramax on 35's with a 6-inch lift kit. I'm looking for a tuner that can delete the exhaust, Fix my speedometer (3-4 mph difference), and boost the performance (HP/MPG). Any help would be greatly appreciated.