dreadnought Posted August 18, 2017 Report Share Posted August 18, 2017 hi all,i have a 1800 bmc fitted in my nb and i would like to change the oil,this is the first time i`ve changed it as the engine is new to me, can the forum recommend the right type/viscosity of oil i need, many thanks Link to comment Share on other sites More sharing options...
Tony Brooks Posted August 18, 2017 Report Share Posted August 18, 2017 I expect SAE 15W40 will be fine in API CC or CD if you can find it. Otherwise API CE or at a push CF, CF will be easier to find but depending on how you use the boat just might cause the bores to glaze over time. MY feeling is that as long as you thrash it now and again and never charge on idle CF will probably be fine but do not hold me to that. SAE 30 or SAE 20W50 should also do the job in the above API grades. Link to comment Share on other sites More sharing options...
cuthound Posted August 18, 2017 Report Share Posted August 18, 2017 (edited) We used Morris Golden Film 20W50 in the Turkish built BMC 1.8 in our last shareboat. http://www.morrislubricantsonline.co.uk/golden-film-sae-20w-50-classic-motor-oil.html It got to 13,500 hours before needing replacement with a Beta 43. Edited August 18, 2017 by cuthound To add a missing worm Link to comment Share on other sites More sharing options...
Richard T Posted August 18, 2017 Report Share Posted August 18, 2017 (edited) I agree with what Tony and Cuthound have said. We have a BMC 1.8 in Tyto. Morris oil is good. Any good motor factors should stock a suitable oil. Another manufacturer is Comma http://www.commaoil.com/passenger-vehicles/products/view/262 If you have a PRM hydraulic gearbox it uses the same oil as the engine Edited August 18, 2017 by Richard T Link to comment Share on other sites More sharing options...
Dutchie Posted August 25, 2017 Report Share Posted August 25, 2017 Use for years this one : http://www.mpmoil.nl/products/index.php?id=1&product=01000B&language=en less oil use and not really expensive , i,m not sure this oil is availeble in the UK. Link to comment Share on other sites More sharing options...
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