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Message:: [QUOTE="izifaddag, post: 8165840, member: 42307"]Just a quick word about getting an oil sample on a second hand truck.It is a brilliant idea. Unfortunately it has one major flaw.The majority of 2nd hand trucks are bought in from fleets all coming up to their 500,000 mile birthday.The first thing that the dealership does is run them through its shop to give them curb appeal. An oil change is the first thing they do. So if you take an oil sample you are whistling dixie. It is a waste of time.An ECU dump is a good idea but it is a bit of a stab in the dark. A LOT of stuff can happen that doesn't show up there. Likewise a service report, they are usually doctored.About the only thing you can do is to use your skills as a truck driver and general observance. My truck pulled a bit. Excellent gear shifting, looping and floating beautifully. Good clutch movement. Brakes like a car. Revs topped out due to computer profile same with top speed.Frame unbent etc etc.So anybody new to trucking who ends up on this thread be aware that an oil sample won't help with a truck purchase. It does help with onward maintenance. I prefer Polaris Labs in Houston.[/QUOTE]