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200 Series General Forum for the Volvo 240 and 260 cars |
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Apologies in advance! Engine oilViews : 1832 Replies : 42Users Viewing This Thread : |
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Nov 14th, 2020, 14:25 | #41 | |
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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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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Nov 14th, 2020, 18:53 | #42 | |
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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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Nov 16th, 2020, 12:45 | #43 |
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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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