This is topic Royal Purple in forum Tech Talk at Northern California Ford Owners  .


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Posted by Sisky Wolf (Member # 350) on :
 
Your opinion on OEM royal Purple Synthetic Oil.
Running break in oil on 3rd new motor..ready to change oil..have heard some good things about RP..normally run Mobil -1

Thanks
 

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Posted by st5150 (Member # 51) on :
 
Don't run synthetic oil on a new motor for at least several thousand miles.
 

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Posted by mustangcam302 (Member # 2315) on :
 
why not??Not tryin to make an agruement on it but just currious why u think you shouldnt run synthetic on a new motor?
 

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Posted by Black94 5.0 (Member # 655) on :
 
If i'm not mistaken ...Syntetics dont let the bearings and rings wear-in correctly........But on the other hand, why do Porsche's and Corvettes come from the factory with "Mobil 1"
 

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Posted by st5150 (Member # 51) on :
 
Black94 5.0 is correct, talk to your engine builder, they'll all recomend against it. I also have personal reasons as why high end oil shouldn't be used on a street car unless the manufacturer recomends it (Vettes, Porches, ect)
 

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Posted by Kevin99GT (Member # 272) on :
 
http://www.svtperformance.com/forums/showthread.php?threadid=28465&referrerid=4022

I'd stay away from Royal Purple. They have a small niche audience of enthusiasts, but otherwise are pretty quiet about their ingredients, which makes people rightfully skeptical about their products. Read that thread above and any other thread from the guy who started it -- he's a certified expert in that kinda crap and knows his shiz.

I'd stick with Amsoil. It's more expensive than others, but the drain intervals are WAY longer and totally reliable (they recommend their true synthetics for something like 25,000 miles between drains. Their cheapy shiz they recommend to 7,500 miles, and their cheapy shiz is the equivalent of what most other companies, like Castrol, sell as their top-end stuff).
 

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Posted by mustangcam302 (Member # 2315) on :
 

quote:

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Originally posted by Black94 5.0:
If i'm not mistaken ...Syntetics dont let the bearings and rings wear-in correctly........But on the other hand, why do Porsche's and Corvettes come from the factory with "Mobil 1"

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This is the exact reason why i was askin, i have asked many a person on which is best and which isnt, and on a lot of things it usually comes down to the opinon of the owner. We had many discussions on this one in Hot Rod U over in UTI, what seems to be the answer IMHO is to do the break in with normal oil, then swap to syntetic after oil change.
 

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Posted by VortechSaleen (Member # 316) on :
 
Here's another weird one...my Saleen manual specifically says to switch to synthetic after 500 miles. And yet it was still purchased just an N/A S281.
 

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Posted by CobramanPhil (Member # 2170) on :
 
I think corvettes and porsches run synthetics is due to the tighter tolerances of the motors. Rings are mostly sealed as compared to your average push rod 5.0 motor (I imagine that the modular motors can switch to synthetics a lot earlier than the older 5.0 based motors). Like someone said above, check with your engine builder. If I were you..I would just run regular oil for the first 5000 miles or so...nothing wrong with that. The most important factor is to make sure you have clean oil and a clean filter. I'd say run regular oil for the first 250 on the new motor (check for metal flake at that point and cut the filter apart). Change the oil and filter. Run the motor for another 2500 miles and then change the oil and filter again. Then when you pull another 3000 or so..change again. Then (finally!) after another 3000 miles change to synthetic with a new filter.
 

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Posted by st5150 (Member # 51) on :
 
Just to add to what Phil said.... us '86-92 5.O guys have forged pistons that run looser clearances compared to the hypertetic pistoned stangs from '93+.

You guys may find this oil post good reading:

http://www.californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=002524

Please excuse CustomFastbackCA while you read that post, even he runs conventional oil in his Saleen
 

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