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> Why Semi & Fully Synthetic has the same viscosity?, Confused

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TSah liew
post Dec 3 2019, 12:19 PM, updated 2w ago

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Hi guys, kindly advise, shell engine oil as an example.

What is the difference between 5w30 semi & 5w30 fully?

Regards.

OvenBaked
post Dec 3 2019, 12:29 PM

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oil viscosity got nothing to do with semi syn/fully syn

This post has been edited by OvenBaked: Dec 3 2019, 12:31 PM
Ar1
post Dec 3 2019, 12:38 PM

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teh tarik and coffee has same viscosity...no?


jamespaul
post Dec 3 2019, 12:54 PM

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QUOTE(ah liew @ Dec 3 2019, 12:19 PM)
user posted image

Hi guys, kindly advise, shell engine oil as an example.

What is the difference between 5w30 semi & 5w30 fully?

Regards.
*
Differences are different base oil but doesnt mean anything more.

The most important thing is manufacturers approval and third party approvals

Semi can have higher performance than fully if the right add pack is used.

Base oil is irrelevant in day to day usage.
zeng
post Dec 3 2019, 01:45 PM

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QUOTE(ah liew @ Dec 3 2019, 12:19 PM)
user posted image

Hi guys, kindly advise, shell engine oil as an example.

What is the difference between 5w30 semi & 5w30 fully?

Regards.
*
HX7 semi base oils are composed of Group I/II mineral base plus a bit of Group III GTL , whereas Ultra fullsyn is 100% GTL base oil .

HX7 has lower spec approval in MB 229.3 which MB recommends 10000 - 15000 km or less oci , whereas Ultra has higher spec approval in MB 229.5 which MB recommends up to 30000 km oci under conditions specified .

In MB engines calling for MB 229.3 , the owner can use Ultra MB 229.5 , however in MB engines calling for MB 229.5 , the owner can't use HX7 MB 229.3 as intended .

IMHO, for typical Asian engines at 10000 - 12000 km oci there is no difference between the two in longevity up to 300000 or 400000 km .

However if for extended oci of 20000 - 30000 km, HX7 MB 229.3 probably couldn't make it in longevities whereas Ultra MB 229.5 maybe fine , basing on metal wear limits adopted by some laboratories and/or OEM's .

Edit:VOA's attached .

This post has been edited by zeng: Dec 3 2019, 01:57 PM
WiLeKiyO
post Dec 3 2019, 03:46 PM

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QUOTE(ah liew @ Dec 3 2019, 12:19 PM)
user posted image

Hi guys, kindly advise, shell engine oil as an example.

What is the difference between 5w30 semi & 5w30 fully?

Regards.
*
Viscosity has nothing do with the oil quality.



 

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