gr8scottw	Royal Purple motor oil - other synthetics	#1
Not too shy to talk Joined: 2016/3/14 15:26 Last Login : 2017/2/23 12:51 From Alamosa, CO Group: Registered Users Posts: 20	Does anyone use Royal Purple synthetic oil, or other synthetic oils in their Packards? My mechanic was suggesting I use it, but wanted to know about others' experiences. I have a 46 Super Clipper with the 356. Thanks, Scott Posted on: 2016/5/10 16:58

64avanti	Re: Royal Purple motor oil - other synthetics	#2
Home away from home Joined: 2013/8/2 17:19 Last Login : Today 17:05 From MKE, WI Group: Registered Users Posts: 801	Do you envision severe duty use or extended change intervals? Does the motor have all new seals? Then maybe. Dinosaur juice with sufficient ZDDP & changed most every fall should hold you for decades. Posted on: 2016/5/10 17:26

gr8scottw	Re: Royal Purple motor oil - other synthetics	#3
Not too shy to talk Joined: 2016/3/14 15:26 Last Login : 2017/2/23 12:51 From Alamosa, CO Group: Registered Users Posts: 20	The motor was rebuilt about 1,000 miles ago. And I could see some highway driving, but probably not cross-country kinds of driving. Posted on: 2016/5/10 17:43

Tim Cole	Re: Royal Purple motor oil - other synthetics	#4
Home away from home Joined: 2007/10/28 9:49 Last Login : 2023/2/8 20:30 Group: Registered Users Posts: 2869	Synthetic motor oils benefit newer engines that run cleaner and generate fewer waste hydrocarbons, CO, and NOx than old Packards. So I don't see a reason to use synthetic because the detergency will be used up faster. Posted on: 2016/5/10 18:34

Cli55er	Re: Royal Purple motor oil - other synthetics	#5
Forum Ambassador Joined: 2008/1/8 23:15 Last Login : 10/27 12:08 From Fort Worth, TX Group: Registered Users Forum Ambassadors Posts: 3650	Motor is rebuilt and all new... Then synthetic. My two cents. Posted on: 2016/5/10 18:49
	1937 Packard 138-CD Deluxe Touring Limousine Maroon/Black 1090-1021 [url=https://packardinfo.com/xoops/html/modules/registry/View.php?ID=232]1955 Packard

Dave Kenney	Re: Royal Purple motor oil - other synthetics	#6
Forum Ambassador Joined: 2006/4/23 16:14 Last Login : 7/14 18:22 From Ontario, Canada Group: Forum Ambassadors Registered Users Posts: 1659	I think a 15w40 Diesel oil like Shell Rotella would do quite nicely in your engine. I used it for for years in my Packard Super Clipper. Synthetics are fine but really overkill IMO. I think that Mobil 1 15w40 or 15w50 would be an OK choice if your feel the need. Posted on: 2016/5/10 18:56
	______________________________________________ Dave

64avanti	Re: Royal Purple motor oil - other synthetics	#7
Home away from home Joined: 2013/8/2 17:19 Last Login : Today 17:05 From MKE, WI Group: Registered Users Posts: 801	Another good thought just occurred to me. Likely the best thing you can do for oil & engine cleanliness on these old cars is to add a PVC system. (Unless you are a purest) Posted on: 2016/5/11 10:42

John	Re: Royal Purple motor oil - other synthetics	#8
Home away from home Joined: 2015/1/16 12:43 Last Login : 2023/7/8 20:42 From sw, pa Group: Registered Users Posts: 1572	Does Shell Rotella still have "zinc" additive in it? I thought I read where they were going to remove it for better diesel emissions. John Posted on: 2016/5/11 11:48

Owen_Dyneto	Re: Royal Purple motor oil - other synthetics	#9
Forum Ambassador Joined: 2007/3/14 18:01 Last Login : 10/29 18:35 From New Jersey Group: Registered Users Forum Ambassadors Posts: 16688	Not that Packard engines require any zinc (ZDDP) with their soft cam loadings, but yes it's still present, reduced from about 1300 ppm in the older CI-4 formulations to about 1000 ppm in the current CJ-4 forumulation. Posted on: 2016/5/11 13:13

gr8scottw	Re: Royal Purple motor oil - other synthetics	#10
Not too shy to talk Joined: 2016/3/14 15:26 Last Login : 2017/2/23 12:51 From Alamosa, CO Group: Registered Users Posts: 20	I guess I'm not sure about the difference between Diesel oil and regular oil. Posted on: 2016/5/17 10:42