Oil compsition which to choose

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Oils compositions from MSDS data sheets.

Which one of these formulations is the more shear stable and likely to have a decent Noack value compared to the others listed.

Climate
0 degC winter to 41 degC summer.
70% City driving and 30% Fwy driving.
OCI 6mths or 10000km.

The vehicle can use any of these oils due to design and OEM recommedation.

Or is this a silly question not enough data.

5w60
INGREDIENTS CAS NUMBER PROPORTION % W/W
1. Mixture of 1-Decene, tetramer, mixed with 1-decene trimer, hydrogenated
& 1-Decene, homopolymer, hydrogenated 68649-12-7/68037-01-4 30% - 60%
2. 1-Propene, polymer with ethene 9010-79-1 < 10%
3. Complex mixture of additives Mixture 30% - 60%


15w50
INGREDIENTS CAS NUMBER PROPORTION % W/W
1. Mixture of 1-Decene, tetramer, mixed with 1-decene trimer, hydrogenated
& 1-Decene, homopolymer, hydrogenated 68649-12-7/68037-01-4 30% - 60%
2. 1-Propene, polymer with ethene 9010-79-1 10% - < 30%
3. Complex mixture of additives Mixture 10% - < 30%


10w40
INGREDIENTS CAS NUMBER PROPORTION % W/W
1. Mixture of 1-Decene, tetramer, mixed with 1-decene trimer, hydrogenated
& 1-Decene, homopolymer, hydrogenated 68649-12-7/68037-01-4 > 60%
2. 1-Propene, polymer with ethene 9010-79-1 10% - < 30%
3. Complex mixture of additives Mixture 10% - < 30%
 
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I would guess the 10/40, as the bigger the difference between cold and hot ratings the more likely the base stock is to break down. A difference of more than 40 (Eg 0/40 or 10/50) is regarded as the boundary between normal and semi race oils that need a more frequent OCI. Trucks use 15/40 and some cars with long OCI's use 5/30 or even 0/20 because they are in effect long life oils and very shear stable.
For most normal use cars the winter viscosity rating is very important in wear terms, so don't pick a 15/40 instead of a 5/40 without good reason.
 
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