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Apologies in advance! Engine oil

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Old Nov 14th, 2020, 15:25   #41
Laird Scooby
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Thank you for that helpful post.

See my previous post!

There are some words that permit [semi] synthetic if they meet certain standards. You appear to interpret those words as specification, designed for, mandatory.
.
The words in my Volvo handbook are "Synthetic/semisynthetic oils may be used as long as they meet the above standards" or very similar, the specs are given above that on the page.
That doesn't necessarily exclude mineral or fully synthetic but experience has demosntrated that semisynthetic is the most widely available at present and was just appearing in the early 80s with almost every car being filled with semi from the factories (regarless of make/location etc) from the late 80s.

The molecules in mineral are larger, synthetic smallest, semisynthetic somewhere in the middle so if oil burning/use is a problem the mineral or semi in preference to full synthetic would be advisable.
Likewise with the grade, 10W40 semi is a very good place to start though!
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Old Nov 14th, 2020, 19:53   #42
Stephen Edwin
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Originally Posted by Laird Scooby View Post
The words in my Volvo handbook are "Synthetic/semisynthetic oils may be used as long as they meet the above standards" or very similar, the specs are given above that on the page.
That doesn't necessarily exclude mineral or fully synthetic ...... 10W40 semi is a very good place to start!



Yes !!

Now we're cooking with gas !!




I've limited the quote to avoid anything we might misunderstand each other on.

Regards David. We are both thee and me trying to do our best I generally reckon.



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Old Nov 16th, 2020, 13:45   #43
AndyV7o
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Just recalled something I was gonna say but got distracted and forgot.
In reference to the handbook stating 'semi synth is permitted' we have to remember/realise the definition of synthetic was different then.
Back then, synthetic only meant 'man made from scratch', ie pao or ester, not at all derived from crude oil. In the late 90's there was a ding-dong betwixt castrol and mobil, as castrol were highly refining by deconstructing and reassembling (in a manner of speaking) mineral base oils and labelling as synthetic. Mobil were not pleased seeing this as 'fakery'. Anyway, the end result being that as the mineral origins were so refined and altered by man to such a degree that they were effectively 'man made', and that as their properties were closer to synthetic bases than mineral, it was agreed that these group 3 oils could legitimately be labelled as synthetic.
So, back in 1993, 'Semi Synthetic' meant it was refined mineral and (usually) pao blended together. Pao was the synthetic oil that caused issues with seals and additives in the early years. So by saying 'permitted so long as it meets spec' they are pacifying any naysayers scared of the word 'synthetic' and stating that the spec will ensure it is compatible with seals, additives, etc.
Nowadays semi synthetic usually means highly refined mineral oil, sometimes blended with group 3, and not usually containing any pao or ester, thus, is generally a different animal to that referred to in the handbook.
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