Re: oil viscosity question....

Posted by Tim Cole On 2016/11/12 16:04:32

The issue here is essentially whether the hydrcarbons are the same. If the hydrocarbon for 30 weight is different than 50 weight then mixing them 50/50 will produce 50% 30 weight and 50% 50 weight. In a refining silo the base oils are separated by layer so thinning heavy paraffin with kerosene is not going to produce motor oil.

I suppose a simple test might be to simply try the mix in an engine and look at the oil pressure. My guess is it will be lower than the proper grade because the light oil will flow faster. However, that might not be a bad thing because valves benefit from light oil.