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For those who like to experiment ,I have run out of the 10/40 fully synth that i got for free a few years ago and have returned to the good old SAE 40 of yore for the 99. I have noticed that the motor is much harder to kick over but is not so clattery when cold or very hot . It was built with racing clearances 30 years ago but is not noisy really . I expect to burn less oil and the plugs to stay a bit cleaner (If i cant start it I will burn no oil at all but the plugs will get very messy!) . The change was made purely on economic grounds ( the 40 was in the shed!) and i may well return to fully synth if i can find a 20/50 at reasonable cost.. Inside the motor everything looks startlingly shiny and clean ( detergent oil) but i wonder if a little carbon would be helpfull to seal rings etc which was probably a design expectation?.
I suspect the story that a…
I suspect the story that a bit of carbon helped sealing was just making the best of a bad job...of oil, bore wear etc! It never made much sense that I could see. But putting a ring on top of a piston when doing a decode did help prevent bits of carbon getting stuck alongside the top of the piston, and by reducing bore wear, perhaps leaving a ring of carbon did indirectly reduce oil consumption by reducing bore wear?
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Hate to start a potential…
Hate to start a potential oil thread, but the lowest cost semi-sinth 20/50 I have found and used for a number of years is:-
Silkolene SUPER 4 20w-50 Semi Synthetic 4-Stroke Oil - 2 x 4 Litres (Lube Cube)
Price: £66.58 Coupon Discount: 10.00% Discounted Price: £59.93
From https://www.opieoils.co.uk/ One reason being I can then use the same oil in the BMW. Tony- Log in to post comments
