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Old 11-30-2011, 05:06 PM
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Royal purple oil

Im running royal purple oil right now and im not sure how many miles i should put on it before changing it? i ve heard that you can run sythetic twice as long as conventional. just wanting to know how long other people run their synthetic oil.
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Old 11-30-2011, 05:35 PM
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i've heard of people runnin 10k, best bet is to get oil analysis at like 5k and see they say. i run schaeffers 6k without problems
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Old 11-30-2011, 05:41 PM
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I'd go with 5K miles, and then switch to Rotella synthetic.
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Old 12-01-2011, 09:25 AM
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Where would you take oil to get tested?
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Old 12-01-2011, 11:03 AM
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Quote:
Originally Posted by 997.3 View Post
Where would you take oil to get tested?
I believe most use Blackstone. Blackstone Labs Costs $25 from them.

Some local places might too. The guy I'm buying my Amsoil from can do an oil analysis too.
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Old 12-01-2011, 11:29 AM
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Quote:
Originally Posted by 997.3 View Post
Where would you take oil to get tested?
Blackstone or oil analyzers are two popular services. Any Cummins or Cat shop should have the ability to get your oil analyzed.

By the by I have read under whelming UOAs of RP.
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Old 12-01-2011, 12:39 PM
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Originally Posted by Zaairman View Post
I'd go with 5K miles, and then switch to Rotella synthetic.
X2 -

I run rotella 5-40 @ 5k intervals and blackstone labs regularly says things look great and that I can go 7,500 at least between changes.

- save your money over the RP.

Running OA is a great idea every now and then to get an idea of how things are going.

Good luck -
SCott
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Old 12-01-2011, 12:42 PM
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I would run it until you can afford to get that crap out and put in rotella or delo.
I used to be a dealer for that where i worked and they gave it to me and i still would rather run delo. it seems to get really ashy really quick, and leak EVERYWHERE!!
it may be decent but not worth the money imo
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Old 12-01-2011, 12:57 PM
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There are cheaper costing oils that have produced much better results on their UOAs compared to RP... via Bobistheoilguy.com

These injectors shear the oil down to a 30WT over a 7K to 10K mile OCI... Thus those who do extended oil changes use a high end robust synthetic HDEO-example-{M1 TDT 5W-40/Schaeffers 9000 5W-40/Valvoline Extreme 5W-40/Amsoil HDEOs}... These seem to handle the shearing better... These are just brands that I have seen UOA on...

The 7.3L loves a Robust-Clean-Fresh HDEO... An OCI between 5K to 7K miles is perfect for a 7.3L with regular Dino HDEO... {Depending on your driving habits}...

Just as an example my neighbor owns a 02 F350 7.3L ... he installed the FS-2500 Oil by-Pass system a few yrs ago... One to his 7.3L and One to his 4R100 BTS Transmission...

If my memory serves me right... He has taken his OCI out to 50K miles before the oils TBN was below safe range... That was with Schaeffers 9000 5W-40... Now he did replace the filter cartridge every 15K miles and added a 2qts of fresh 5W-40 to help replenish some of the additives and tbn...

With the high end synthetics if you don't add a oil by-pass system of some sort and extend your OCI using a UOA... Your just wasting your money...

Any of todays dino HDEOs can be pushed to 10K mile OCI easy...
If you live in a very cold climate? I can see using a 5W-40/0W-40/5W-30 HDEO to aid with the very cold start ups...

If your going to spend that much money for an oil change with any full synthetic why not get your moneys worth out of it... But this is just my thoughts... nothing more... It's your hard earned money....

Just one more thing... You can use Rotella RTS 5W-40 and acheive the same or better results then the expensive RP...
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Old 12-01-2011, 03:57 PM
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I ran half RP and half Rotella T 15-40 for a while, but I found with experience and cost that the level of oil analysis from the half and half-to the T6 synthetic was not different I was told I was good to run 7500 between changes on both, and it is much less expensive to run T6!

~Phil
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