15W-40 vs 5W-40 Cold weather
Hey Guys,
I have a 1999 Ford 7.3L and with winter on the way and the days and nights getting colder I've found my baby getting harder to start. I don't think I'm having any engine issues its just the cold weather. So as to that I was just curious to what everyone thinks about running 5W-40 vs 15W-40 for cold weather use? The coldest it's ever gotten here is -23F and that was setting a record, most I can except on a daily basis is 3 degrees F. That being said the 15W-40 at 3 degrees is thick like molasses so would it be better to run 5W-40 for the winter time? I do plug my truck in every night but while I'm at school she sits out there in the cold all day long with no love. |
5W-40 full synthetic helps a ton
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I run 5w-40 year round. Anyone driving in cold weather should be using it at the very least, in the winter. 15w-40 is only for people in the far south where it almost never goes below freezing.
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Thanks for the reply guys.
I went with some left over 15W-40 Full synthetic from AMSOIL got it free and it seems to be working great and is way less thick at the same temperature vs regular 15W-40. AMSOIL makes a 5W-40 Full synthetic as well so I'll be checking that out in the near future. |
So is it a bad Idea to be switching back and forth between the two on a yearly basis? Will this not cause any issues in the future?
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