Is this stuff worth the change? Does it offer anything over the factory Mobile 1?

 

I have it in my trans and diff. Made a difference in those areas.

I've used it in my engine for the last couple of oil changes and I can't really tell any difference over Mobil 1. It just costs more

 

I am using RP in my engine and do notice lower temps...there are mixed reviews and even some claims that that RP was making unfounded claims in regards to product performances.

I can tell you this, Amsoil synthetic in my tranny (just had a complete flush done) has made a WORLD of difference. I notice better shifting, lower operating temps esp when i "get on it", and am not worried about getting a cooler now...Now anyone that tells you the trans temp shouldnt ever get above 200 is not being forthcoming as i have had HIGH ranking people that build them for a living recently tell me that is an impossibility for said action to not occur. Same gentlemen have told me that upon breaking down and/or rebuilding motors and tranny's w/ RP versus other products, RP's consistently had more damage to bearings, etc...I personally have seen the lower temps and all that has been run in mine has been mobil 1...but I am now sold on amsoil...

Having said all that...you are going to get an overload of yea's and nay's...do's and dont's.

Its all about personal experience brother. Its kind of the philosophy of opinions are like a$$holes, everyone has one...and everybody else's stinks but our own....LOL!

Do what your research inclines you to believe and get the results for yourself and be sure to post them up for us all.



For me, I am going to give the Amsoil synthetic oil my business at my next oil change. Why? The results from the tranny flush were almost instantaneous.

 

I use RP in my car and like it, Is it any better that factory fill? I think so. I am sure factory fill is just fine, It depends on how you drive your car. I drive my car easy and why not have the extra protection...
Bill K

 

With Mobil 1,my coolant temp for the last 6 months has been a pretty consistent 199-200f , since changing to RP about a month ago,it runs @ 190-192f ,and the average ambient temp has gone up appx 10 degrees (from 65f to 75f)
Nothing else has changed,so I'm figuring it's gotta be the RP that's making it run a bit cooler.
Costs a bit more,but I'm going to stick with it.
I'm basically a cheapskate,except when it comes to the Vette,then I'd like to have the best,and IMO,Royal Purple is just that.

 

Lots of info on Royal Purple if you Google it regarding false and unsubstantiated performance claims. Mobil 1 is fine.

 

Don't vary from Mobil 1 in the engine. Period. Also don't wait for the programmed interval, it does get dirty (carbon), I change mine at 5,000mi. or less, some are religous at 3,000 miles, nothing wrong with that. You cannot do better than Mobil 1 Fully Synth. Do all the research (not opinion hunting) that you can if you doubt it, I have, and it all comes back to Mobil 1 without any additives. I run Mobil 1 in every engine that I own, even the roto-tiller, mowers and generators.
I put RP with their slip additive in the diff, only 5,000 miles so far, but seems to be perfectly fine so far.
.... but then again, as stated above, I am just another a$$hole with another opinion.

 

I have not used RP yet. I've also seen all the negative ads about the RP claims and so on. For me, I've been using Mobil1 since my first car back in the 70's and not once have there been any issues. In fact, I've gotten more miles out of many engines by a long shot than most people ever dream of.

 

There are a million threads on this subject is you just use the search function. It doesn't really matter what oil you use, just make sure that it meets GM4718M spec and you will be fine. Royal Purple is Ok, Amsoil is better but why use these expensive oils, when there are many documented threads on this forum of members getting 200k and even a couple getting 300k using Mobile 1

Just change when the computer tell you to, or once a year (why change sooner, GM warranties the engine and they say follow the computer or 1 year so why waste your money) and use the cheapest oil that meets the GM4718 spec.

For my last oil change I used Pennzoil Platinum, it was $3.90 a qt and it meets GM4718M

 

where do you guys buy either rp or amsoil diff and tranny fluid??

 

Thanks but I am well aware of the search function. The problem with the search function is that they are old threads which sometimes contain old and outdated information.
I was looking for (possible) new information therefor I started a new thread.

To everyone else,thanks for your info and input. It is much appreciated.

 

Royal purple synthetic motor oil is supposed to contain more ZDDP, a lubricating agent. Mob. 1 has the minimum 800 ppm. RP allegedly has 1200. EPA changing standards in respext to catalitic converter life caused lowering this additive. RP claims its oil can meet the Fed. standards with more ZDDP, owing to its smaller, more controlled refining process. Whether any of this is accurate I do not know. I have changed to RP in both of my Corvettes. This subjected received rather thorough engineering analysis in Corvette Enthusiast Mag. sometime in the last twelve months.

 

While that may be true, the reality is that these newer roller motors don't need the ZDDP at the levels that are required for the older flat tappet motors. I use Diesel rated CI-4 or CJ-4 in my old Corvettes and Mobil 1 5W30 in my C5.

 

 

In my boosted C5 I use RP and it works for me, now with saying that on my stock C6 I use Moblil 1 and will continue this with both Vettes, boost gets the higher dollar oil and the stocker the GM fill

 

Not true. All of the recent oil analysis reports I've seen with Royal Purple 5w30 show it's ZDDP levels to be between 700 to 900 ppm, same as pretty much all of the SM rated oils in the stores. It also still has the nasty habit of thinning out from a 5w30 to a 5w20 rather quickly as well.

 

1st oil change: Mobil 1 (drives normally)
2nd oil change: Royal Purple (drives normally)
3rd oil change: Mobil 1 + lucas synth oil stablizer (less expensive and drives normally)

I noticed no added advantage of the Royal Purple engine oil.

 

I run RP and the oil temps run a few degress lower than mobil 1. The only thing I hear if you track your car and bring the temps real high RP has a tendency to become like water.

 

some members swear by it give it a shot

 

It's not a tracked car. For the most part its just a daily commute car.