RP was one of my sponsors for SEMA, they gave me a case of 5w30 XPR which is their full race oil. I didn't see the sense in spending that kind of money to keep XPR so I stepped down to HPS since I don't race the car often enough to justify it. They use the same additive in both formula's.:favorites13:

9 quarts of Mobil 1 = $100

How is it wasting money if the car gets driven hard and still runs like new? Would it do the same if I changed it less frequently? Maybe. Am I willing to find out? No. Oil changes are very cheap compared to the cost of a new engine.

Because most likely you would be able run it at least 5k miles before it needs any changing under the same conditions. The idea of 3k mile oil changes was true in the old days. Oil has advanced plenty over the years. Also check out bobistheoilguy.com/

http://www.edmunds.com/car-care/stop...-your-oil.html

I drive the crap outta my car. Changed the oil once so far and I'm at 17k miles! Had it 8 months.

Id def send in a sample and see how it looks.

Always go with what works for you. I've been building and racing cars since the late 70s and have never had an oil related failure. I'll stick with 3000 mile changes.

Oil change cost?
 

When it comes time to change my Amsoil ill be sending it off for analysis. I may change it at 8k just to see where I am at there.

Exactly your living in the 70's. Oil tech ahs came a long way just like engines. Saying the oil then is like the oil now is just stupid.:banghead:

Oil change cost?
 

That is just way to risky on a synth-blend oil, even if it's Motorcraft

I honestly will change mine between 6-8k. It just sounds right. :sunot:

I'm at like 7.5k now on this oil change and its about time. Gotta go spend $80 on some Royal Purple I guess.

Waste of cash.

Post up the results if you don't mind, Amsoil is what's going in next and I'd like to have more results to compare too.

Compared to Motorcraft? I'd have to disagree.

You really need to research motor oil....Just for shits. What makes motorcraft bad?