Compression Ignition Addict
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if you search youtube, you will find a video or two from people that have seperatly extracted oil both from the pan, and from the hpop reservior. they place a small sample of each in seperate plastic cups, and do a side by side comparison swishing the cups around, and video the behavior of the oil inside. granted - this is very low tech - but even still, there is a definate and obvious differnce between the behavior of the oil.
think of it this way - you are constantly filling, and re-filling your fuel tanks. by the same principle, your tanks should be totally flushed and clean inside, but if you were to drop you tanks, you will no doubt find all the sludge and sh-t that has settled onto the bottom. the same applies here. the heavier and worst of the oil will collect on the bottom, and given its properties will tend not to mix or empty into the pan. the thinner oil flows, the heavier sits.
if you ask around you will find that most people that do not belive in this, have never tried it, and examined what came out. there have been people amazed about what was pumped out from the reservior from a truck that has never had it done before.
if nothing else, think of it as taking one more step to protecting your injectors. if you can spend a few minutes that even has a chance of saving you thousands, why not do it.
now im NOT saying that ignoring it will harm your truck. but the reality is that if you dont do it, your leaving behind old oil. even though its only quart, i highly doubt you would screw you pan drain plug back in while it was still draining. your doing exactly that. why take the chance?
the trend on the message boards seems to be that its not necessary, or even dumb. all i can tell you is i do it every oil change and i have a 17 year old truck that still runs PERFECT on its original injectors. you will have to decide for youself how much that is worth to you.
yours might very well be clean inside the reservior - but the idea here is to keep it that way.
Last edited by kctyphoon; 02-13-2012 at 10:37 PM.