fluid questions??

[wide body]

either this weekend or early next week i intend on draining every fluid in the truck and replacing it. i'm a big fan of amsoils stuff and was planning on putting thier fluids in the differentials, transmission and transfer case. what i'm going back and forth on is it worth it to use their motor oil? from what i've read on here you guys all recommend changing the engine oil every 5000 miles....RELIGIOUSLY....so is it worth the considerbly higher cost of the oil just to drop it back out in 5000 miles? what about the option of sending the oil off to a lab and having it tested every so often and changing when the results say it's time?

are you guys running by-pass filter systems? opinions on those would be greatly appreciated as well.

i will probably flush the coolant system as well. do i need to run a specific coolant?

[TEX420]

How many miles do you have on your truck? Im at about 44,xxx and havent changed anything besides the oil and fuel filters. I run synthetic oil and go about 7 - 10 thousand miles before changing.

[wide body]

i believe it's 62,200 give or take a bit. 10k miles sounds a little better. we run 15k on our peterbilts but they don't have any of this smog stuff. they are old school diesels. i read a post on here recently questioning the use of synthetics for the simple reason of the truck going through regen. with the regen process, the trucks apparently end up with fuel in the oil so why bother with the extra cost of synthetic.

i'll be getting my truck smogged tomorrow so i'll be able to see what the process is here. from what i understand, they actually strap the truck to a dyno and put a load on it. not sure why that is, but i guess that's what they do. i'll know more tomorrow. without the DPF in place, i would think the oil changes could be stretched out a bit? just a guess though......

[jhowell]

Just my 2 cents, but if it were me and this is what i did: Change your oil with what ever you want(i used Motorcraft) to and send it off at 4,500 miles to get a oil analysis done to see how much fuel dilation you have and go from there. I now have mods done to the truck and no longer have the fuel dilation issue. As for the coolant, I run the Amsoil coolant. All fluids in my truck are Amsoil.

[wide body]

thanx for the input.