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Re: Royal Purple motor oil - other synthetics
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Home away from home
 
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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
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Re: Royal Purple motor oil - other synthetics
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Not too shy to talk
 
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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
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Re: Royal Purple motor oil - other synthetics
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Home away from home
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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
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Re: Royal Purple motor oil - other synthetics
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Forum Ambassador
 
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Motor is rebuilt and all new... Then synthetic. My two cents.
Posted on: 2016/5/10 18:49
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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 |
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Re: Royal Purple motor oil - other synthetics
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Forum Ambassador
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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
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Dave |
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Re: Royal Purple motor oil - other synthetics
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Home away from home
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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
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Re: Royal Purple motor oil - other synthetics
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Home away from home
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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
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Re: Royal Purple motor oil - other synthetics
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Forum Ambassador
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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
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Re: Royal Purple motor oil - other synthetics
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Not too shy to talk
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I guess I'm not sure about the difference between Diesel oil and regular oil.
Posted on: 2016/5/17 10:42
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