27-08-2017, 06:33 PM
(27-08-2017, 01:12 PM)Nigel was in Brittany Wrote: My first post on the new forum ,there was a thread running on the Bravenet forum about running in on 30 oil with the Australian pistons (ex Holmsdale sevens ) and what milage to change the oil . I have done 301 miles on the oil , is it time to change it , and can I now use Halfords Classic 20 /50 ?.
Nigel,
300 miles is enough for an engine to run-in
Has your engine got an oil filter ? if so change the oil and use 20/50. If no filter drain and fill with SAE 30 or 40
All multigrade oil contains an additive to keep particles in suspension, which are removed when the oil passes through the filter. SAE 30 (known as straight oil) does not contain those additives therefore particles drop out and remain in the sump until it is drained.
If using 20/50 without a filter you will increase the wear within the engine, however as most of our engine are lucky to do 1000 miles per year it would 10 years before you notice.