Jerry Bransford said:Oil collects contaminants at the same rate, no matter if it is synthetic, mineral, extended-change, or whatever. Change your oil at every 3-5K miles and your engine will last longer than it would if you waited to change the oil. And factory style oil filters cannot filter out those contaminants which include acids and combustion byproducts.
Nicely said, I agree 100%! Manufacturers of so-called extended-life lubricants fail to mention that they do absorb contaminants at the same rate as conventional oils do, thus they still need to be change frequently.kbart said:IMHO, synthetics will not break down as quickly and lose their lubricating properties as soon as regular oil. They do however become dirty just as fast. So, in conditions with a lot of dirt, water, dust or HD use one needs to keep it changed regularly. The cleaner you keep your oil and air in your engine the longer it will last. I run a name brand synthetic 10w30 but still change it every 3k miles, 2500 if I did a lot of wheeling.