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Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
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Oil Smackdown: 5w-30 C1 vs 0w-30 A5/B5Views : 1341 Replies : 5Users Viewing This Thread : |
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Jun 27th, 2019, 17:10 | #1 |
Dave
Last Online: Sep 7th, 2023 11:33
Join Date: Apr 2016
Location: East Yorkshire
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Oil Smackdown: 5w-30 C1 vs 0w-30 A5/B5
Anyone with a Euro IV 180/185 D5 tried 5w-30 C1 as an alternative to 0w-30 A5/B5?
From my research the specs are very comparable however with the C1 the sulphated ash (known for blocking up emissions equipment) is less than half of that of A5/B5 spec oils. Castrol 0w-30 A5/B5 Spec Sheet Castrol 5w-30 C1 Spec Sheet My rationale for switching - I currently run 5w-30 A5/B5 of which there are a multitude of cheaper options than the rather monopolised and expensive Castrol 0w-30 A5/B5, no reason not to use it in the UK climate. However if I can run my car on 5w-30 C1, in theory that will less frequently block the DPF that could potentially; - Reduce DPF regenerations - Increase Economy (more diesel injection is required during a regen) - Minimise oil dilution with diesel and maintain protective viscosity for longer - Minimise the event of an engine runaway from rising oil in the sump (Though the ECU would warn you) The Lubrizol Relative Performance Tool appears to support this theory (Select ACEA 2016 on the left and tick 'C1' and 'A5/B5'). I know there's some dogmatic Volvo owners on here but I'm frankly not interested in comments along the lines of; "Volvo specify this oil, if you don't use it then your shells will implode, a rod will shoot out from your sump and your car will turn into vessel destined for Valhalla" I am by no means an oil specialist but would be interested to hear the opinions of one or a like minded individual.
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Jun 27th, 2019, 17:52 | #2 |
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Last Online: Jun 21st, 2021 20:47
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No!
C1 is NOT at all appropriate, these engines are not designed to run with such little anti-wear components in the oil. The equivalent to A5/B5 would be C2, but it still isnt great in these engines, plus, contrary to seemingly apparent logic (nothing is straightforward with oil and engines) C spec oils can cause -more- dpf trouble in these than using the full saps A5/B5. Add to that, whilst talking oil with millers and total, both stated not to use C soec oils in the D5. Im trying to wangle details as to their own reasoning, but they said do not use anything other than full saps very adamantly even though C spec should be backward compatible. (There are some reasons why it isnt always backwards compatible 100%) |
Jun 28th, 2019, 17:09 | #3 | |
Dave
Last Online: Sep 7th, 2023 11:33
Join Date: Apr 2016
Location: East Yorkshire
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Quote:
I usually run my car with an additive like Liqui Moly Ceratec or Archoil 9100/9200 but as it appears that the higher SAPS of an A5/B5 is required, in particular the phosphorus and sulfur for their anti-wear and antioxidative qualities then I guess I'll steer clear of the C1.
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Jun 28th, 2019, 19:45 | #4 |
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Last Online: Jun 21st, 2021 20:47
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It has baffled many, and still does!
One explanation is that the mid/low saps gets burnt more easily amd actually loads the dpf with ash much more prominently than the full saps under certain conditions, so although the full saps is more poisonous, it can cause less trouble. I dont recall all the detail, this is very recent news and isnt well established yet afaik, I need to do more study in this area to fully grasp the subject. This is a very vague summary of what has recently been found but gets the main point across. |
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Jul 1st, 2019, 09:10 | #5 | |
Dave
Last Online: Sep 7th, 2023 11:33
Join Date: Apr 2016
Location: East Yorkshire
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Quote:
Nonetheless the oil change this week will be done using Fuchs Titan XTR 5w-30 A5/B5 and LiquiMoly Ceratec. And thanks for chiming in Andy your comments have been helpful.
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