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Synthetic Oil Change - Cold Start Issues
Vehicle: 2006 F-250 6.0 Bulletproofed w/FICM upgrade
Problem: Any time it drops below 25 degrees it won't start; motor turns over but it doesn't catch.
History: Started having this issue the day after I had the oil changed about two weeks ago. I was stupid and didn't do my 6.0 research. Took the truck to the dealer and they put in 15w40 oil (non-synthetic). The following morning temps were around 10 degrees F and the truck wouldn't start. In the process of trying to start the truck while being jumped, I burned up the starter (after taking it off, I realized it was going to be due for a replacement anyways). Replaced both batteries and the starter and the truck started (around 40 degrees F outside).
Fast forward two weeks to yesterday. Big snow storm comes in and the temperature was around 15-20 degrees. Truck wouldn't start again after sitting overnight and most of the day. I could tell the batteries were having a hard time as the cab lights were flickering when the truck was trying to turn over.
I do not have an engine block heater cord, so plugging in overnight will be an issue until that is solved. I pulled the brand new batteries and one was reading 74% and the other 88% (don't remember voltage). I'm not sure if that is due to them being cheaper batteries (Motorcraft Gold) in cold weather or there is some kind of power draw slowly draining them along with being cold. I have the batteries inside and charging right now, so I will be putting them in this morning sometime and reporting back to how the truck starts.
Obviously y'all will tell me that I need to measure my voltage when trying to start the truck, etc. I'll get on that when I get the chance. But here's my big question:
If I change my oil to say Rotella T6 5w40 full synthetic, is it likely that I will get the truck to start since it won't take as much effort to push that thick, cold oil through the engine? Secondly, if that is likely to help, can I just drain the oil where the truck sits and fill it full of T6 without changing the oil filter since I literally only have 100 miles on it? The truck is levelled on 35's, so crawling up under it in the snow shouldn't be too big a problem, I'd just rather not do it if y'all think it won't help.
Thanks for your input.
2005 F-250 CCSB 6.0L:
SCT X3, IDP Tunes, CTS Insight, 2.5" Leveling Kit, 35" Toyo's, 20" KMC Wheels, Rancho 7000's, EGR Delete, ARP Studs, Updated FICM, Built Tranny, '03 Turbo, 3" Downpipe, 4" MBRP Exhaust, Blue Spring Mod, 20" Lightbar, Door Seal Mod, BedRug, UnderCover Flex Cover, Badges Shaved, Painted Grille, Handles, & Mirrors, HD Headlights, Tinted Tails, 5% Tint