Royal purple - Ford Powerstroke Diesel Forum
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post #1 of 22 Old 02-03-2010, 07:33 PM Thread Starter
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Royal purple

Anybody ever use royal purple for anything. I am putting in a new clutch this weekend. I was thinking about doing some fluid changes and considered trying out some RP in the rear pumpkin, and maybe the trannies also, thought I would see what you guys thought about it.

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post #2 of 22 Old 02-03-2010, 08:19 PM
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I run royal purple in front and rear end and in transfer case. I figured out I gained bout 1 mpg overall. I ran it in my snowmobile and made me a firm believer in it after i gained bout 10 mph on top end.
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post #3 of 22 Old 02-04-2010, 02:55 PM
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Not me. I changed mine out for Amsoil. Do some reading on the issues with RP.

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post #4 of 22 Old 02-04-2010, 03:04 PM
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i'v always heard good things on RP, i know i seen different things on tv shows about it, and they hooked a 4x4 truck up to a dyno with regular oil, tried a couple different kinds, and then with RP and a couple other synthetics, and the RP showed the most gains in freeing up power/torque and gaining MPG's i forget what it was on right now :S it will come back to me sometime lol

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Lol what kind of frankenstroke did you buy???

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post #5 of 22 Old 02-04-2010, 09:50 PM Thread Starter
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Hmm. I will have to do some research then.

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post #6 of 22 Old 02-05-2010, 09:01 PM
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The dyno test was on horsepower tv on spike
i know some folks dont like royal purple but i have a cool story
about why i will never run anything else...
So a couple years ago i bought this jeep and i was planning all the mods
and cool stuff i was gonna do to it, finished the suspension, axles, body and the whole works and bought a v8 and tranny to swap
the original engine was a 2.5 liter 4 banger and i decided to put some rp
in it and wheel it like hell for the summer till it blew up.
I took the thing out and BEAT it, not hard on it i beat on it like
i have never treated a motor in my life. Red lined up hill climbs, clutch dumps, i mean i felt bad. Long story short the thing was sold at the end of the summer to a friend who is still running it today at 230k
Royal purple is the only oil i run in any of my vehicles
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post #7 of 22 Old 02-06-2010, 03:47 PM
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I ran rp my first oil change that i did then i ran rotella syn. So far i can't tell the difference. For $65 difference i think that i will use the wal-mart rotella.

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post #8 of 22 Old 02-06-2010, 08:54 PM
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I first started with RP but that is really $$$, amsoil is cheaper, and might be better.

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post #9 of 22 Old 02-07-2010, 07:25 AM
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ever since i saw this pic on SVTP i stay away from RP, car had something like 20k on it and RP was used since it had come off the lot.



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post #10 of 22 Old 02-07-2010, 08:51 AM
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That is the problem with RP. They are one of a very few who use Moly as an additive and over time it will combine and fall out of suspension. Heat makes this problem worse so I would not consider it myself. It has been known to gunk up filters and oil passages if used in an extended drain but if it is changed frequently enough that shouldn't be a problem. There are just better solutions out there for the money. Yeah, Yeah, a lot of racers run it but they change the oil after every race.

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