engine oil
Alistair Phillips

Stoke-on-trent, UK

#1 Nov 27, 2010
Hallo everybody just a quick one is it ok to 10/40 semi synthetic engine oil in my 1980 shadow11
Jan Forrest

Rotherham, UK

#2 Nov 27, 2010
That should be fine as long as you change it regularly along with a filter change at least at alternate oil changes. The oil lifetime should never exceed 6 months or 5K miles, whichever comes sooner. It certainly doesn't hurt to flush the engine with a 50:50 mix of DERV:cheap engine oil before changing the filter to get rid of any accumulated crud in the sump at the same time. In these 'older' type of engines it's more important to change regularly than the quality of the oil used. If the recorded mileage is significantly in excess of 100k I would recommend a thicker oil - 20W50 - to reduce the tendency for it to creep up the bores and into the combustion chambers.
The less you use the car, the more important is the regular changing of the oil and flushing it through due to the increase in water getting into it without being then boiled off by the heat of the engine.
Alistair Phillips

Stoke-on-trent, UK

#3 Nov 27, 2010
Thanks for that but would it be ok to use 20/50 sermi synthetic
Jan Forrest wrote:
That should be fine as long as you change it regularly along with a filter change at least at alternate oil changes. The oil lifetime should never exceed 6 months or 5K miles, whichever comes sooner. It certainly doesn't hurt to flush the engine with a 50:50 mix of DERV:cheap engine oil before changing the filter to get rid of any accumulated crud in the sump at the same time. In these 'older' type of engines it's more important to change regularly than the quality of the oil used. If the recorded mileage is significantly in excess of 100k I would recommend a thicker oil - 20W50 - to reduce the tendency for it to creep up the bores and into the combustion chambers.
The less you use the car, the more important is the regular changing of the oil and flushing it through due to the increase in water getting into it without being then boiled off by the heat of the engine.
Alistair Phillips

Stoke-on-trent, UK

#4 Nov 27, 2010
Thanks for that but would it be ok to use 20/50 semi or synthetic oil.
Jan Forrest

Rotherham, UK

#5 Nov 27, 2010
As you should be changing the oil at the intervals I recommended there wouldn't be any advantage in using the more expensive fully synthetic oils. Mostly the extra ingredients are there to extend the life of the oil. However they rarely fully compensate for any water and/or other contaminants that accumulate in it which are just dumped along with the oil at a lower cost when using cheaper oils along with regular changes.

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