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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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The end of 10W/40 engine oil?Views : 4341 Replies : 26Users Viewing This Thread : |
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Nov 18th, 2017, 03:55 | #11 |
Non Fragile
Last Online: Oct 13th, 2023 06:46
Join Date: Apr 2010
Location: Chadderton, Oldham
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Right, let's clear some things up here:
In oil viscosity ratings, the first number is it's performance when at operating temperatures. So saying a 0W oil helps cols starts is nonsense. The second number is it's performance when cold, so saying a 30W oil is thinner than a 40W oil is only stating the obvious. While thicker oil does necessitate extra drag, it is miniscule compared to the effort required to turn two camshafts. Next time you've got the belt off, try it. The starter motor extra drag when cold is caused by metal contraction, but even that doesn't really compare to the effort to overcome valve springs. The starter motor is unaffected by oil viscosity. This extra strain 40W oil puts on a starter motor is imaginery, as my 188,000m motor has verified today. |
Nov 18th, 2017, 09:26 | #12 | |
Premier Member
Last Online: May 2nd, 2018 09:14
Join Date: Sep 2011
Location: DownSouth
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Quote:
The W is for winter, as it relates to the viscosity at minus 18C, the second rating is for plus 100C. There is a real difference in the load on the starter and battery when cold starting an engine when using an 0W rather than a 10W, although it would need to be a real cold day for that difference to be audible. The difference in fuel economy only relates to the period the engine is warming up in terms of the W figure, once its warm the second rating is of more importance, although the differences are not very significant. The additives in the oil also have a slight effect, so some of the modern oils have more Moly (Mo) additives than required in wear protection terms, as it reduces friction slightly.
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2003 V40 1.9TD Mods: Scratches, bent bumpers, raised REAR mats & internal mud guards. SHELL ULTRA 5/40 & LIQUI MOLY CERATEC. Everyone should DYOR (Do Your Own Research) Last edited by skyship007; Nov 18th, 2017 at 09:48. |
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Nov 18th, 2017, 11:00 | #13 |
VOC Member
Last Online: Today 09:28
Join Date: Mar 2008
Location: Northampton
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+1 ^^^^^^^
My old P1 2.0lt petrol was run on 10/40 all its life and got to 370,000mls with no problems. All regular oil change intervals and new filter every change. That is what Volvo recommended. My P2 is run on 5/30 as that is what Volvo recommend for the VVT pulley to work correctly and over a long period of time. It is now on 130,000mls and no issues with rattly start up or anything else for that matter. Again regular oil changes and engine flush every second change to keep everything spotlessly clean.
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2001 V40 2.0lt Sport lux - Daily Driver. 174k miles. 2003 C70 2.4 GT Convertible - Garage Queen. 65k miles. http://www.neptuno6benagil.com |
Nov 18th, 2017, 20:37 | #14 |
Non Fragile
Last Online: Oct 13th, 2023 06:46
Join Date: Apr 2010
Location: Chadderton, Oldham
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That makes absolutely no sense. How can an oil be less viscous at cold temperatures than at hot?
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Nov 18th, 2017, 20:49 | #15 | |
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Last Online: Mar 24th, 2023 09:58
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Location: Lincoln
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Quote:
This somewhat tedious article contains 2 tables showing the parameters of the different measurements: http://www.machinerylubrication.com/.../oil-viscosity Basically if you compare 0W40 and 10W40 oils both offer the same viscosity (SAE40) at running temperature, but the 0W will circulate more readily during a cold start than 10W.
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'02 (51) silver Volvo S40 1.9D - RIP (Turbo) '02 (52) blue Volvo V40 1.8 - RIP (Head Gasket) '04 (54) blue Volvo S40 1.9D Sport - RIP (RTA) '18 (68) silver Volvo V40 T3 R Design Last edited by ilikewatch; Nov 18th, 2017 at 21:11. |
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Nov 19th, 2017, 19:04 | #16 |
Non Fragile
Last Online: Oct 13th, 2023 06:46
Join Date: Apr 2010
Location: Chadderton, Oldham
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Thanks, that makes sense now.
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Nov 21st, 2017, 21:27 | #17 |
I ate all your bees
Last Online: Sep 1st, 2023 18:00
Join Date: May 2012
Location: Rickmansworth, Herts
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My SAAB 900 has been running on 10w40 for the entire 35,000 miles I've done in it. 2 weeks ago I switched it out for 5w40 fully synth because it was being sold off for £16 for 5 litres.
There's no doubt its smoother on startup now. just anecdotal but it does seem that a lower cold viscosity has a benefit or two. Once warmed up feels no difference. It may be relevant that before I put this oil I retorqued the head bolts and changed the rocker cover gasket, which after 21 years use was laughably permeable.
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'98 Saab 9-3 2.3i Conv owner. Former keeper of 1996 Saab 900iS 2.0 conv, 2001 V40 2.0i, 1999 Mondeo TD, 1995 Mondeo TD, 1990 Passat GT16v, 1983 Passat 1.8CL |
Nov 22nd, 2017, 21:13 | #18 |
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Last Online: Apr 13th, 2022 10:41
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This may well be why my local tesco petrol station were selling 2l bottles of castrol gtx 10/40 for £3 a few weeks ago, annoyingly they only had 1 left, if they had got more i would have bought 3 and done an oil change, i got the last one though, handy for top ups.
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02 V40 T4 S, "Sargent silver" she's back!
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Nov 22nd, 2017, 22:02 | #19 |
Monster Raving Loony
Last Online: Nov 12th, 2018 21:03
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Brand X stop selling the cheap stuff and tell us to buy the expensive stuff instead. The supermarkets are very good at this, have been doing it for years. Why do you think so many people vote with their feet (wallets) and go to Lidl ? Buy brand Y.
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1994 850 2.0 bought at 32,000 miles used daily now 45,000. Still like a nearly-new car 2004 filthy polluting diesel VW |
Nov 23rd, 2017, 08:33 | #20 |
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Last Online: Sep 19th, 2020 15:38
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I love these oil threads. It makes me secure in the fact that my beloved hobby of fishing is absolutely not dull!! 😆😆.
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04 S40 saloon 1.9D. Let's see how long it lasts...... '53 plate V40 2.0s petrol estate. Stolen, now dead. |
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