Quote:
Originally Posted by Honzo
Sorry to bump this but I'd just like to say I just changed my oil and put in RP's 5w30 with a Motorcraft FL-820S 
I've never changed the oil myself until now but I wanted to know if anyone else has had to put 6 qts in their engine. this is strange to me and seems like too much but it said the capacity in the manual was 5.8 quarts... Also, how often should i change out RP? Every 5000 miles?
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From Royal Purple's website:
"Royal Purple recommends following the manufacturer’s maintenance intervals while the vehicle is under factory warranty. In clean engines that are no longer under warranty, oil change intervals may be extended up to every 12,000 miles or annually, whichever comes first. Oil filter changes should be done as recommended by the filter's manufacturer and oil should be topped off as needed.
In dirty engines, Royal Purple recommends the standard 3,000 to 5,000 mile oil and filter change interval until the engine oiling system is clean and free of deposits left by lower quality oils and / or poor maintenance or mechanical problems. This will allow time to gradually remove existing deposits without overloading the oiling system. Mechanical problems such as fuel dilution, coolant leaks into the crankcase, poor air filtration and / or failure to maintain proper oil level are all detrimental factors to the service life of any engine oil. Any one of these factors can significantly shorten the useful service life of any oil."