Quote:
Originally Posted by electric_monk
Over the years I have always done the oil changes on my bikes myself. Recently, due to circumstances I asked my regular mechanic to do the oil when he had the bike in the shop.
The bike is a 1989 R100GS and I have always used 20/50 mineral oil. He used semi-synthetic for the change and over the next few days the engine was leaking like a sieve...When I discovered that he had used semi-synthetic I immediately changed to mineral and the oil leaks stopped without any other actions....
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This does not make sense unless the Garage put a different grade oil (thinner one) in as a mineral 20w-50, semi-synthetic 20w-50 and a fully synthetic 20w-50 have the same properties.
They will all have 20w Cold Crank and meet sae50 at 100degC
Cheers
Guy
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