Without wanting to open a debate on personal oil choices does anyone know what oil the wonderful guru Mick Hemmings would have recommended for using on one of his rebuilt Commando engines. I had years of wonderful help from him and Angela with my 99-I am sure someone out there had the same help with their Commando and I would value the advice he possibly passed to them. thanks in anticipation -Alan
As no one appears to know I…
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Have always used a 20/50…
Have always used a 20/50 mineral oil in three Commandos I've had - in the old days it was Castrol GTX while for the past decade have used Halfords Classic , changing every 1500 miles.
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That sounds a good bet…
That sounds a good bet Gordon, will get some for my 99. I would prefer a fully synthetic multigrade with an Ester base though .
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Millers do that in their CFS…
Millers do that in their CFS range, it contains ZDDP and will endure short burst of temperature upto 150 C.
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Or even better...
... Smith & Allan at 1500ppm:
https://www.smithandallan.com/product/smith-allan-ultra-20w-50-mineral-engine-oil-3986
Cheap as well.
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Castrol GTX classic 20W/50
Why does nobody suggest this? Is there something I don't know? I noticed this in the recent posts titled "Castrol GTX 20W/50 availabilty" as well.
My understanding is that the "Classic" 20W/50 is the same product as the Castrol GTX we all used years ago, before they changed the standard GTX to the modern GTX which is synthetic based. It has high zink and sulphur content and all the other additives that we need and none that we dont. It's no good for modern engines so that's a good sign too.
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I use Castrol Classic 20W50…
I use Castrol Classic 20W50 on my MK3 without any problems. I change it and the oil filter every 1000 miles but that's probably way before it's required. There is a very detailed post on the Access Norton Forum concerning the qualities of different oils and Castrol Classic 20W50 comes out very well indeed. Anyway for what it's worth that's what I use. Discussions on oil types have been and will be argued about until the end of time. We all have our favourites!
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Castrol GTX
"My understanding is that the "Classic" 20W/50 is the same product as the Castrol GTX we all used years ago"
Highly unlikely.
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Ref your 99 and GTX
If my memory serves me well? If your using an oil containing a detergent it should be run through a filter.
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High detergent levels
A very valid point Dave. One I've argued myself a few times and been shot down on, but I still stand by my research. Modern oils with high detergent levels are designed to suspend combustion residues and wear particles in the oil until they are filtered, which should be the biggest consideration against using modern oils in classic engines if you have no filter. However, the key word is HIGH. Engine oils have always had detergent amongst the additives since day one, but nowhere near the high levels found in modern oils.
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Straight 50
Alan
Like you I have good memories of dropping in on Mick and Angela in Northampton. I lived in Stamford at the time so it was a short ride. I never discussed choice of oil with Mick. This was because I was then, and am now, totally happy with the oil I use in my Commando (750cc Fastback made in 1994/95 by what was then Fair Spares).
From day 1 to the present I have used nothing but Mono grade 50 with detergent, summer and winter. The brand has nearly always been Silkolene Classic Hardwick 50. On the tin (not one of those plastic containers), it describes itself as:
"Classic/ vintage SAE 50 mono-grade oil with good detergent and a high level of anti-wear additives".
I change the oil every couple of thousand miles and so far, 52,000 miles on, I have had no engine issues. I plan to be riding it 'round France at the international rally next month.
For Commandos, Norvil Motorcycles recommend Mono 50 in summer and Mono 40 in winter. A lubrications guidelines sheet I have from Andover Norton recommends 20W/ 50 Multigrade or 40W Mono grade.
Hope this helps rather than confuses. Robin
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Straight 50
Thanks Robin, I suspect Mick himself would have said Mono 50 or Mono 40 - I was just hoping to close a loop and have a question answered he sadly can't.
Mick and Angela made a great team -she would adorn your receipts at Christmas with stars and glitter-a nice touch.Your mention of a 750 Fastback reminded me of my callow youth as a 17 year old living in the South Lakes in the early seventies -thrashing round on a 68 Fastback thinking I was something special ! I hope you enjoy the rally and thanks again for everyone’s time and comments. Alan
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If you are getting on a bit,…
If you are getting on a bit, a multigrade will make a 750 easier to start from cold and get around faster on start up. An ester based fully synth oil stays on surfaces exceptionally well and will give enhanced protection ,albeit at extra cost and you wont find a 20/50 easy to source ,especially on trips away. Thinner oil will get used a bit faster ,thicker oil will run more quietly in an older motor. I have run my 99 on 30, 40, 50 , 20/50 and synth Yamalube 10/40 over a number of years . All with plenty of magnets fitted. With the thin synth oil consumption and noise was slightly up , but noticably a very lively performance with absolutely nothing on the magnets and a very clean motor. (no filter!). Mayonase in the tank problem dissapeared , dont know why. Not yet tried a 20/50 or 30/60 fully synth . But would like to . A gallon of inexpensive Millers classic 20/50 will have to get used first. You are spoilt for choice !.
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As no one appears to know I would suggest you consider a good 20/50 which will be better for cold starts.