I don't mean to bring up this an arguement again, but you all are pretty ignorant.
second there's NO motor oil that still good after 15,000 miles
AMSOIL and Royal Purple are not your average Synthetic the difference between Mobil 1 and AMSOIL is like the difference between Dino and Mobil 1.... Running an engine over 10,000 miles on Mobil 1 is insanity... doing it with RP or AMSOIL is conservative... if not wasteful.
do some reading, get educated and then come back to the table... I think everyone here owes BudrBean a big old freakin apology...
come on, say it with me:
"I have no clue what I'm talking about, I don't even know the name of the products described so obviously I was maybe a little bit ignorant... I will, in the future, do some research before I lay out my uneducated opinion and mislead people who might read this later"
see that wasn't too hard was it.
The more you know:
and obviously, just like with conventional oil, synthetics... hell tylenol at home... the recommended intraval is an EXTREMELY conservative estimate in order to avoid complete idiot not checking there OIL and running the vehicle dry.... just because you don't change it doesn't mean you don't check it.... or change the filter.
But to state that no oil is still good at the extended intravals that people routinely run RP and AMSOIL is not only wrong... it is damaging... a complete noob who doesn't kbnow anything might come here and believe that what you say is true and therefore miss the opportunity to try one of these products based on the uneducated opinions here.
I have used AMSOIL in every engine of every vehicle i have owned for the last 6 years... I change it at 12,000... only to be conservative, I have friends who routinely run 20,000... it is killing me that my truck has Dino in it, but i do believe in running 3,000 break in, then 5,000 with mobil 1 or a similar low end oil... then its on to AMSOIL.