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ka
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Joined: 03 Dec 2007 Posts: 600 Location: Orkney.
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Posted: Wed Jul 31, 2013 7:40 am Post subject: 20/50 oil |
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Just picked up an interesting article from someone who knows an awful lot more about oil than I do.
His article (published in the August Bulletin of the Morgan Threewheeler magazine), makes reference to 20/50 oil in particular and the adoption of a standard introduced by Japanese motorcycle manufacturers in the 1990's addressing the falling shear-resisting protection supplied by 20/50 oils, identified by JASO MA, or the later JASO MA2.
To cut the article down to the crux, his advise is that if you value your big-end(and who does not?) choose a quality 20/50 synthetic ester-based oil, and not the cheaper 'banger' oil at the bottom end of the price range. He also makes reference to ensuring the 20/50 oil has the W for winter rating. _________________ KA
Better three than four. |
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baconsdozen
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Joined: 03 Dec 2007 Posts: 1119 Location: Under the car.
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ukdave2002
Joined: 23 Nov 2007 Posts: 4105 Location: South Cheshire
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Posted: Wed Jul 31, 2013 1:09 pm Post subject: |
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I can get my head around most things engineering wise...oil chemistry however remains a complete mystery!
Dave |
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kevin2306
Joined: 01 Jul 2013 Posts: 1359 Location: nr Llangollen, north wales
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Posted: Wed Jul 31, 2013 1:57 pm Post subject: |
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for me, good quality oil changed very regular does it every time. cant understand peeps who use low quality oil or dont do frequent oil changes.
especially important in classic engines due to the usual low yearly mileages. a gallon of even the most expensive oil is way cheaper than an engine rebuild.
these people are decent suppliers and very helpful when requesting information and specifications/applications
http://www.opieoils.co.uk/
kev |
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peter scott
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Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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Posted: Wed Jul 31, 2013 5:15 pm Post subject: |
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Mineral oils break down under stress such and high temperature or pressure. Synthetics are much better and are designed to cling on to surfaces so they are still present when you start after an extentended period. Don't believe that you are getting something better just because it comes in a can rather than a plastic bottle.
And don't believe the rubbish about detergents in modern oils. They are good in any engine.
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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ka
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Joined: 03 Dec 2007 Posts: 600 Location: Orkney.
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Posted: Wed Jul 31, 2013 5:51 pm Post subject: Oil Pressure/Compression |
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Just followed this link,
http://www.opieoils.co.uk/
The person who knows more than I is a development bod at silkolene! _________________ KA
Better three than four. |
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Phil - Nottingham
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Joined: 01 Jan 2008 Posts: 1252 Location: Nottingham
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Posted: Wed Jul 31, 2013 6:26 pm Post subject: |
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Whilst it is quite true you get what you pay for but what is more important is do you need it?
For the more common butterfly classic its a waste of money buying expensive oils just as much it would be for an oil buring old banger _________________ Rover P2
Rover P4
Rover P5 & P5B
Land Rover S2 & S3
Morris Mini Traveller Mk2 |
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ukdave2002
Joined: 23 Nov 2007 Posts: 4105 Location: South Cheshire
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Posted: Wed Jul 31, 2013 6:55 pm Post subject: |
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My brother in law bought a brand new Corsa some years ago, it had its first oil change at 70,000 miles, he had however diligently topped the oil up with the cheapest supermarket stuff...every time the oil warning lamp stayed on
The 70,000 oil change occurred because the head gasket failed due to a lack of coolant (vauxhall hadn't bothered to fit a low coolant lamp !!) and the gradual increase in engine temperature had gone unnoticed
With its single oil change and new head gasket the little car did another 20,000 miles without attention before he traded it in, where it was still running like new.
It did make we wonder what benefits if any, doing regular oil changes with quality oil would have made to this car? Did the original "quality" oil provide some longer protection, or was it a one off? ......all questions above my pay grade!
Dave |
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kevin2306
Joined: 01 Jul 2013 Posts: 1359 Location: nr Llangollen, north wales
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Posted: Wed Jul 31, 2013 7:20 pm Post subject: |
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i must admit to keeping an eye on the deals in the local asda and buying the castrol gtx when on offer for £12 a tub.
dont always need it when its on offer but usually buy 3 or 4 tubs at a time.
i used to run my ford sierra on the oil my diesel fitter best mate got me, bought with 3000 miles on it and sold with 100k on it and the motor was still sweet as (3000 mile filter and oil changes tho) ive still got 25 liters of that in the shed! does oil loose its qualities through standing? (by qualities i mean the additive side of things)
any1 local to me is welcome to it if they are in need (llangollen)
kev |
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ka
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Joined: 03 Dec 2007 Posts: 600 Location: Orkney.
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Posted: Thu Aug 01, 2013 7:48 am Post subject: Oils |
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I also had the advice, to buy supermarket oil, and change it every 1000miles, difficult to know what to do for best isn't it? _________________ KA
Better three than four. |
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colwyn500
Joined: 21 Oct 2012 Posts: 1745 Location: Nairn, Scotland
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Posted: Thu Aug 01, 2013 8:12 am Post subject: |
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I used to run my old side-valve Austin on 20-50 because it wasn't easy to get monogrades in the 1980s. The information I was given was don't use a detergent oil in an engine that has not been re-built because there will be an accumulation of sludge that will get dislodged. This can cause problems in oilways. Older gaskets are also more prone to being penetrated by detergent oils. I suspect that there aren't many un-restored side-valves on working cars out there now.
The engine has still not been dismantled but after loads of oil changes is now very clean. So I now use straight 40 SAE as orginally specified. The engine is definitely quieter (or is that a psychological response?). The most obvious difference is that the inside of the filler tube no longer gets any coating from oil splash or mist implying to me that the oil is remaining more viscous even in this hot weather.
Even on my old cars, serious engine issues have been very rare and I have also noted that people who are significantly less conscientious about servicing than me also seem to have no engine problems. |
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AlpineAndy
Joined: 09 Sep 2013 Posts: 2
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Posted: Tue Sep 10, 2013 9:44 pm Post subject: 20/50 |
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I use the 20/50 from Unipart = it has the same rating codes as the Comma 20/50 classic oil. Mileage is low. I live in Holland and 20/50 harder to find - so just pick it up on on the yearly trip home.
Andy |
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baconsdozen
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Joined: 03 Dec 2007 Posts: 1119 Location: Under the car.
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kevin2306
Joined: 01 Jul 2013 Posts: 1359 Location: nr Llangollen, north wales
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Posted: Sat Sep 14, 2013 12:21 pm Post subject: |
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we could do with an 'oil watch' between us really so if any1 sees something like castrol gtx etc that asda (other supermarkets are available) sell usually at £20 a can reduced to their normal sale price of £12 we can stock up (assuming its suitable for your car that is).
kev |
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BigJohn
Joined: 01 Jan 2011 Posts: 954 Location: Wem, Shropshire
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