IH_always 
SCKS My dad has a Chevy with a 6.0 gas and 275,000 miles. 15-40 is the only thing he has ever put in it. digfaster
Liberty, MO 147,000 miles and don't use oil, if it works don't fool with it, wouldn't think one more case of oil would make too many problems. I never liked changing brands of oil or weights of oil midstream unless I was having problems. Just my way of thinking. Dan Loehr
Holland, Indiana (SW IN) I put 15-40 in a 4.3 V6 one time pegged the oil pressure decided not to do that again but it called for 5W30 --try it and see how much higher the pressure is ---that is if you have a gauge on the truckAn idea possibly worth what it costs Good luck-- Dan young buck1
Sibley county Minesota
15W40 will work just fine. jd4930
Central ND I bought a 6.0 with 120,000, drive it until 225,000 when it got totalled for the second time, it got 15-40 Deere most of the time I had it IH_always
Central, IL I've ran JD 15w-40 in my 02 Chevrolet for the last 185,000 miles. No problem here hwdcne
Soutwest Ks. With the amount of miles you have, everything is probably a little looser then factory specs. The 15-40 would probably be fine. I wouldn't put it in a new vehicle with the close tolerances and also warranty would probably be void.
Pilot Grove, Missouri The biggest problem I see is the 15W40 is a diesel oil with an additive package designed for diesel engines. Patrick rancherman
I use 15w40 Conoco fleet in every thing that has an oil pan. Tractors, cars, pickups, 4 wheelers. regardless of fuel; gasoline, diesel, propane. Been doing this for more than 20 years.. on the same machines... can't be too bad on them! How's that for simplifying inventory in the shop? tom-ky
Morgantown, Ky Dan Loehr - 8/5/2016 15:58 I put 15-40 in a 4.3 V6 one time pegged the oil pressure decided not to do that again but it called for 5W30 --try it and see how much higher the pressure is ---that is if you have a gauge on the truck An idea possibly worth what it costs Good luck-- Dan We ran 15W-40 in 4.3's in a fleet I worked in in the past, 200,000 plus on them without problems. Even ran it in the service truck air compressor. ahay68979
Saronville NE I use 15w40 in everything on yard from tractors, pickups, semi, have even put it in a 4wheeler before. Deere Meat
He changed the oil and put in 15w40. Engine began acting up. I forget after 15 years, running rough or something. Took it to the dealer and talked to the service manager. "You're a farmer?" "Yes." "Changed your own oil?" "Yes." "Put 15 40 in it like everything else on the farm?" "Yes." "Well drain it out and put in the oil Chevrolet SAYS to put in it." Solved the problem. Edited by Mike SE IL 8/6/2016 06:47 dimerunner
Indiana I've seen a couple of guys have trouble with getting oil in the lifters with the thicker oil in these newer engines. I would run what the manual recommends. BShauler
North Central Iowa I have run 15w-40 Cen-Pe-Co in everything on the farm. My wife's 08 Edge has 180,000 miles on it and has had it ever since i changed the oil at 500 miles.. The dealer told me I was going to ruin the motor with that thick oil. Thin oil is nothing but the company's trying to get the last little bit of fuel mileage for the gov regs. My 13 Harley even says in the manual to use 15w-40 diesel oil in it. And that is what I run. Just remember that the bigger the spread in the numbers you are just living on viscosity improver's. Syn oil is not better, it just last longer. Everyting else about syn oil is just marketing hype. cotman
Edited by cotman 8/6/2016 13:09 What type of oil does a 6.0 Vortec take?This vehicle takes full synthetic oil 5w-40.
What kind of oil is best for high mileage engines?10 Top-Rated Oils and Additives for High-Mileage Vehicles. Valvoline High Mileage with MaxLife Technology Synthetic Blend Motor Oil. ... . Pennzoil High Mileage Motor Oil. ... . Slick 50 Recharged High Mileage Treatment. ... . Gumout Fuel System Cleaner. ... . Royal Purple High Mileage Synthetic. ... . Techron Fuel Cleaner. ... . Mobil Super High Mileage Oil.. How many quarts does a 6.0 Vortec take?Capacity: With filter 6 quarts. After refill check oil level.
What kind of oil does a Chevy Silverado 2500hd take?Mobil 1 - Extended Performance 5W-30 Full Synthetic Motor Oil, 5 Quart (Part No. 14977)
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Best oil for high mileage 6.0 vortec
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