Another Oil Question

[Badapple]

How frequently do you guys using synthetic oil change your oil and filter. I always changed my in the past every thousand miles to get the crap out of the engine, not really for viscosity reasons. Do you wait longer with Synthetic?

Thanks

[Kampnnut]

I use Amsoil and change oil and filter every 5,000 miles. When I changed it last time the oil still looked good. Not black just a nice caramel color. I use synthetic in all my vehicles. I change the oil in the car 10 to 12k and the truck 20 to 25K. My truck is a diesel with a bypass filter setup.

[BUCK]

.............5k...................

[elvisVerde]

I saw the results of a professional viscosity retention test of some dino and syn oils, and while the synthetics did have more initial and more retained viscosity-and it was a real difference-there was a fairly significant degradation of even the syn oils at about 2k miles.

While the syn oils are better than dino oil, if someone said to me that for the next 2k miles I could run new syn oil, or a used syn that was retaining only 80+ % of viscosity, which would I choose? Dang, I wouldn't touch the lower quality oil, but that is what all these guys are doing when they run to 5k or 7.5k. It is better than dino, but it ain't like having new, that is for sure.

I change at about 2-2.5k, I have seen the numbers and I cannot ignore them.

[Badapple]

Thanks for the help guys. I think I will probably go with 2.5K just to make sure the oil is clean. I guess filters are more sophisticated now than they use to be. Better safe than sorry though