5.0L General Discussion This section is for non-tech specific information pertaining to 5.0L Mustangs.

15w40 Royal Purple for 5.0 engine?

Old Sep 18, 2009 | 12:44 PM
  #1  
333cobra50's Avatar
333cobra50
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From: California
Question 15w40 Royal Purple for 5.0 engine?

Hello Everyone, New member here needing some help.
I've got a 5.0 with few mods and wanted to put the best oil in my engine. Is 15w40 Royal Purple too heavy or should I go for it? My car gets few starts since its a weekend warrior...
Old Sep 18, 2009 | 12:57 PM
  #2  
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Derf00
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15w is too heavy, you can use 10w-40 but at room temp the 15w will be slightly thicker than 10w, i.e. youll get more wear at startup with the 15w
Old Sep 18, 2009 | 12:59 PM
  #3  
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Mattalicious
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Castrol Edge imo.
Old Sep 18, 2009 | 01:20 PM
  #4  
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333cobra50
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Unhappy

would it be ok if I mixed it with a lighter oil same type like 5W20? I got the 15w40 for free, so I kinda want to use it if i can. Also I just put a cobra upper and lower intake so i know i have to do an extra oil change. it gets kinda pricey.
Old Sep 18, 2009 | 01:21 PM
  #5  
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i use royal purple and i wouldnt say its the absolute best synthetic out there. ive heard the mobil 1 is very good. 10w is fine. the 15 might be too much.
Old Sep 18, 2009 | 01:58 PM
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wrong section newb
Old Sep 18, 2009 | 02:04 PM
  #7  
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better than the 2010 guys posting "Hi I just got my new 2010" in the TECH section
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