i changed my oil last at the end of april and have only put on 1500 miles since then. i know there have been countless threads about the mileage of synthetic oil before changing and was wondering how long i can wait to do mine. thanks
It can stay clean for 7k, but I change my Mobil 1 every 3k miles. It costs $25 for 5 quarts at walmart (it comes in a jug). Royal purple thins out, and doesn't hold its viscosity well, so I would switch to mobil 1. RP is some thin, expensive sh1t.
If you read up on the internet oil test/review sites, you'll find that Mobil 1 is no longer formulated the same. My co-worker told me he read that it's not even pure synthetic anymore, but they still charge the same price.
I doubt there's any better oil than the likes of Amsoil and RP. RP isn't even that expensive. I picked up 5 quarts for 30 bux on sale, and for 5 bux more I'd say it's a much better oil at a slightly higher price.
Your co-worker is wrong. Mobil 1 is fully synthetic, not a blend.
I know people that have tested RP. It's crap. Look up some threads on modularfords....you'll see what I mean.
I'll ask him what website he read that on and see what it says.
In what way is RP crap?
Oil Forum
I'm betting this is where your coworker read that. I've still been using Mobile 1 just because I can't find Amsoil and friends of mine have voiced concerns about excesive valve noise (don't know what that could mean but it scares me) when running RP.
I think the deal with Mobile one is the class of synthetic that it changed to not that it's a blend now. I think it went to a class 3 from a class 4 which points to it being less pure and having a lower boiling point. But I don't feel like searching for it right now and this site has a lot to read up on about oils.
There is alot of speculation, nothing more, about the Mobil 1 formula. They are super duper secretive about it, much more so than any other brand. They have a line of lesser oil and a line of better oil now, so I believe that is where the speculation started.Send a link on that Mobil 1 report. From what I know, it is one of the very few that is fully synthetic. Says so right on the 5 quart jug. Mobil 1 sells non synthetic too, so maybe that's the mix up.
Check out this link http://www.modularfords.com/forums/f4/oil-forced-induction-85473-3.html (last post by hardcore) . That boiling test is enough to keep me away from RP. I have read too many good ratings/reports about mobil 1 to stop using it.