11-01-2019, 08:08 AM
It seems like oils are like domestic LED bulbs, if SAE 20 acts like SAE 30 and a 9watt LED is like an old 60watt bulb. I wonder what the viscosity of our oils are like just before we do an oil change, thinner or thicker. In my case definitely thinner as I rarely top up the engine oil, so I suspect that it is thinned out by petrol as there is little evidence of condensation around the oil filler.