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gr8scottw

Royal Purple motor oil - other synthetics

Not too shy to talk

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

Home away from home

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

Not too shy to talk

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

Home away from home

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

Forum Ambassador

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

Forum Ambassador

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

Home away from home

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

Home away from home

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

Forum Ambassador

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