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Oil (15W-40)

I know that this topic is elementary to some, but please bear with us.  
In selecting the oil for my first change for my 328IC:

As you all remenber the infamous Consumer Reports article which states 
that the Starburst Symbol with the "API SH" designation is the only 
oil to use.  Well, I can't find a 15W-40 oil with it.

Manual says 15W-40.  Someone has just asked which brand, and received 
the reply that a dealer uses Shell Rolletat.  I had looked at this 
today and noticed that it is designed for diesels.  So I went home and 
checked the owners manual and found the Engine  Oil Specifications as 
"CCMC and/or API ratings" :

"Preferred":
 
CCMC-GW, CCMC-G5, CCMC-G4/PD2, or CCMC--G5/PD2

"Also Approved":
API SG, API SH, API SG/CD, etc.

I finally purchased Pennzoil 15W-40 which is also stated to be for 
diesel and gasoline engines with "API Service CG-4, CF-4, CF-2, 
CF/SH".


My Questions:

What is the CCMC specification and is "CCMC-G4" the same as "API 
CG-4"?

Is this Pennzoil O.K. to use?


Thank-you
Marc

'84 Chrysler New Yorker (In-laws' gift for use at condo on Block 
Island, R.I.

'68 Porshe 911 (awaiting paint)
'89 Volvo 240 Wagon (wife and family daily)
'94 Honda Civic (my daily)
'96 328IC (awaiting first oil/filter)