Mobil 1 ep or royal purple

[ryan2022]

Originally Posted By: NHHEMI
Originally Posted By: ryan2022
I may be wrong, but I'm not sure royal Purple was ever intended to do the same Job oils like Mobil 1 Extended Performance or Amsoil do.

If it were me, I'd run the regular mobil 1 which has excellent cleaning agents, but keep the oil change to 5-6K miles.

I dont think you'd safely get your money out of the Mobil 1 Extended Performance.


RP is an extended drain capable oil. 12-15K.


hmm, I didnt know that. They dont advertise it much, good to know!

 

[NHHEMI]

Originally Posted By: ryan2022
Originally Posted By: NHHEMI
Originally Posted By: ryan2022
I may be wrong, but I'm not sure royal Purple was ever intended to do the same Job oils like Mobil 1 Extended Performance or Amsoil do.

If it were me, I'd run the regular mobil 1 which has excellent cleaning agents, but keep the oil change to 5-6K miles.

I dont think you'd safely get your money out of the Mobil 1 Extended Performance.


RP is an extended drain capable oil. 12-15K.


hmm, I didnt know that. They dont advertise it much, good to know!


RP FAQ:

How often should I change Royal Purple in my passenger car?

Royal Purple recommends following the manufacturer’s maintenance intervals while the vehicle is under factory warranty. In clean engines that are no longer under warranty, oil change intervals may be extended up to every 12,000 miles or annually, whichever comes first. Oil filter changes should be done as recommended by the filter’s manufacturer and oil should be topped off as needed.

In dirty engines, Royal Purple recommends the standard 3,000 to 5,000 mile oil and filter change interval until the engine oiling system is clean and free of deposits left by lower quality oils and / or poor maintenance or mechanical problems. This will allow time to gradually remove existing deposits without overloading the oiling system. Mechanical problems such as fuel dilution, coolant leaks into the crankcase, poor air filtration and / or failure to maintain proper oil level are all detrimental factors to the service life of any engine oil. Any one of these factors can significantly shorten the useful service life of any oil.

http://www.royalpurple.com/faqs-motor-oil.html

I have seen used oil analysis on RP( not on this site - my friend did it and showed me )where it( 10w30 )was still good at 15K bt nearing the end. I have run it 12+K myself with no problems.

 

[grease_monkey]

Well we ended up using regular m1 due to pricing and put the car on a regimen of 1. Quart of mmo with m1 for 5k.

 

[gfh77665]

You won't go wrong with either, but after looking into Royal Purple recently, I have learned its one really good oil. Might be the most underrated oil around.

 

[ledslinger]

right now I am doing a timing belt on it.

I'm pretty sure 2.7s have chains.

 

[znode]

Why exactly is RP still API SL on its 5W-20, 5w30, and 10w30 weights? Just didn't bother to get it retested or something?

 

[d00df00d]

API SM puts stricter limits on the amount of certain substances that sometimes decrease wear but always increase emissions. Royal Purple is generally aimed at people who care more about performance than emissions, so they don't like that compromise.

 

[NHHEMI]

Originally Posted By: znode
Why exactly is RP still API SL on its 5W-20, 5w30, and 10w30 weights? Just didn't bother to get it retested or something?


I have asked them this specifically. The answer was they feel to reformulate to meet API SM would degrade the performance of the oil. They also do not feel that API SL causes any significant Cat risk. So, they have no intention of reformulating.

 

[gfh77665]

Originally Posted By: NHHEMI
Originally Posted By: znode
Why exactly is RP still API SL on its 5W-20, 5w30, and 10w30 weights? Just didn't bother to get it retested or something?


I have asked them this specifically. The answer was they feel to reformulate to meet API SM would degrade the performance of the oil. They also do not feel that API SL causes any significant Cat risk. So, they have no intention of reformulating.


Two thumbs up for RP!