5w 40?
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Tuned
Joined: Mar 2010
Posts: 258
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From: Northern Virginia
5w 40?
Ive been reading that with a higher mileage truck its good to eventually switch to 5w 40, is this a good idea, what about synthetic. Dont want to drag this out to a big discussion. Just getting ready for the winter. thanks, I have 170,000
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Tuned
Joined: Mar 2010
Posts: 258
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From: Northern Virginia
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Senior User
Joined: Apr 2010
Posts: 191
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Just switched to the 5/40 & it does seem easier to start & less 'clatery'; where I live it's pricey @$120 but if it keeps it in one piece a bit longer then worth every penny!
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Tuned
Joined: Jan 2006
Posts: 293
Likes: 1
Mileage doesn't matter. Mines got 265000 and i'm using Rotella T6 synthetic. Changed oil at 8000 miles last oil change and the lab test can back normal with a recommendation to stretch interval out to 10,000 miles. Can't complain about that....
Former Vendor
Joined: Feb 2010
Posts: 1,803
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Did Blackstone do the test?
What is your driving like - short or long trips, towing or no?
Ed
Ed@ficmrepair.com
Laughing Gas
Joined: Jul 2003
Posts: 893
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From: Lincoln, Nebraska
I had my pickup into ford about why my milage went to hell in one tank and has stayed that way and it was smoking alot and of course it wouldnt smoke for them and they found nothing wrong. so i asked them about switching to 5-40 for the winter and they have never heard of any one running that so i looked in the owners manual and it doesnt say anything about using that oil either for any temp ranges. Would it void my warrenty if i went with 5-40 for the winter?
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 26
From: Middle Tn.
Will not hurt anything. Just for your info, there is approximately four qts. of oil left in the hpop system and no, you don't need to get it out.
More Turbo
Joined: Aug 2009
Posts: 551
Likes: 19
I had my pickup into ford about why my milage went to hell in one tank and has stayed that way and it was smoking alot and of course it wouldnt smoke for them and they found nothing wrong. so i asked them about switching to 5-40 for the winter and they have never heard of any one running that so i looked in the owners manual and it doesnt say anything about using that oil either for any temp ranges. Would it void my warrenty if i went with 5-40 for the winter?
A 10w-30 is much more shear-stable than a 5w-40 according to my UOA's, and like I said much cheaper, usually it can be had for $11-$13 a gallon vs. $19-$22 for the cheapest 5w-40.