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The Norfolk Broads Forum / Broads Boat Owners Q & A / engine oil BMC 1.5 Diesel
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Posted By Discussion Topic: engine oil BMC 1.5 Diesel

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thassos
Oct-03-2012 @ 6:43 PM                           Permalink
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could any one tell me the best Grade engine oil to use for an oil change on an old BMC 1.5 Diesel. The engine is in good condition. The manual says use 20/50 grade but would a semi synthetic 10/40 grade be better.  

SOS247
Oct-03-2012 @ 6:48 PM                           Permalink
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SAE 30 or SAE 10/40 std mineral oil is better suited.

Regards
Jason

PS - in fact they will run on most oils and 20/50 can still be used but
you don't see it that often at boatyards etc. Synthetic sometimes
protect the internal parts too much as the engines never really work
hard enough.
  
www.facebook.com/ludhambridgeboatyard



They say that 'Hard work never killed
anyone' however, sleepless nights,
stress, not taking breaks & not eating
correctly may just get you there early!!


This message was edited by SOS247 on Oct-3-12 @ 6:52 PM

waterbuoy
Oct-03-2012 @ 11:38 PM                           Permalink
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I have made a study of the specification outlined in the BMC 1.5 manual. The manual says 20/50 and class CC which stands for "commercial" i.e. in the days the engine was made commercial meant diesel of moderate duty. Furthermore modern oils have detergents that are not suited for the older engine.
If a simple mesh strainer is used on the pump inlet, low detergent oils are a must.  Detergents keep all the 'rubbish' in suspension and allow it to circulate.  Simple mesh strainers aren't efficient enough to remove it and  so it continues to circulate causing damage.The CC marking is obsolete, but was replaced by "CE" which in turn was replaced by "CF-4".  

These oils work to the specification of MIL-L-46152 and MIL-L-2104B which is also mentioned in the BMC manuals.

Some manufacturers have created a 20w/50 oil especially formulated for the older "classic" car engine. I therefore recommend looking out for such oils. I have been using it in my BMC 1.5 B series diesel. It works well and the oil pressure holds up, which is a concern in older engines, where parts are starting to wear.

Here are some manufacturers' oil:
Castrol Classic 20w50
Morris Golden film 20w50
Halfords Classic 20w50
Comma Classic 20w50


Most of my references come from
this site

Detergent advice

Hope you find this useful.

Clive

Home - IP11 & Away - NR12



This message was edited by waterbuoy on Oct-3-12 @ 11:48 PM

gallopinhairpin
Oct-04-2012 @ 6:15 PM                           Permalink
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Well, those two links make interesting reading. I've been using Halfords 15W/40 Enhanced Mineral Diesel Oil in my 1970's-vintage Perkins 4.108 for the past four seasons (changed each year, with new filter, just before lift-out). The Perkins manual lists quite a range of different lubricants, in which 15W/40 and 20W/50 are included. I'm guessing the BMC engine, of similar vintage, uses pretty much the same list. I'm also guessing that using detergent oils in my engine would be ok because it's fitted with a paper-element filter. However in view of your recommendations, coupled with the fact that Halfords states that the 15W/40 is suitable for diesels from mid 1980's to early 1990's, I've decided to return my latest can and swap for their Classic 20W/50.


Regards,
Mike.

Strowager
Oct-04-2012 @ 6:30 PM                           Permalink
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The opening poster mentioned semi synthetic.

When synthetics and semi-synthetics first appeared, I wondered whether they would be best on some of my older engines, (boats, cars, bikes).

Since they are more expensive and are essential crucial protection to most modern engines, one would think they'd provide more protection for wearing surfaces on older engines too.

They can however, cause big problems on engines that have already been run on mineral oil. The switchover to synthetic often breaks down any rubber oil seals and causes them to fail, something to do with the chemical composition.

The consensus from most professional sources is to stick with mineral oil for engines that were produced before synthetics came in.



This message was edited by Strowager on Oct-4-12 @ 6:33 PM

steve
Oct-04-2012 @ 6:43 PM                           Permalink
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hi there ,
i use 20/50 oil in our 2.2 bmc , as mentioned it works as a detergent oil as well , we get our oil at our local wilkinsons ,  

steve and vicky

expat
Oct-05-2012 @ 5:15 AM                           Permalink
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I cant answer to whats best for your engine but I will reply to the stay away from synthetics comment, my 1993 ford f150 with a 5.0 litre engine has 465000 miles on it, the last 265000 with synthetic.It has never had any internal work done to it , in fact the valve covers have never even been off,it uses no oil between oil changes and starts with instant oil pressure on -40c cold morning starts.I use a 20 50 synthetic in my 22 foot sunrunner with a 235 horse mercruiser and it runs smoother and better than it did with the correct mercury oil in it.We use synthetic in our fire trucks [all diesels]
and they run fine, theyare either at wide open throttle or idle for hours on end.It is about twice the cost of regular oil but well worth it in my opinion.

Strowager
Oct-05-2012 @ 6:59 AM                           Permalink
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After reading Expat's post, I'll clarify my post about synthetics.

I was repeating the professional advice I'd had about not switching to synthetic or semi-synthetic in an engine that had already run for some years on mineral, becuase of the effect on rubber seals.

I heartily agree that synthetic can give extended life compared with mineral when used from new. I had a VW Passat TD that had covered 256,000 miles and also used no oil between changes.

springsong
Oct-05-2012 @ 7:56 AM                           Permalink
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A test was done a few years ago on a new BMW car with synthetic oil. 500 000 miles on the road and then 500 000 miles under laboratory conditions on a bench. The end result was no appreciable wear in any components.

Barry

" A well balanced man has a
drink in each hand "   Billy
Connolly

thassos
Oct-05-2012 @ 3:56 PM                           Permalink
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thanks to every body for the info on engine oil grade for my old BMC 1.5D it's helped me make my mind up .
Hopefully she will keep going for many years to come.
Once againe cheers everybody for the help Smile


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