🚀 go-pugleaf

Hi.	Some facts about oil viscosity and mixing.

	1 - The effect of one viscosity oil on another is
	not linear! A lower viscosity oil will bring down
	the viscosity of the mix even in small percentages.
	Contrastingly, You have to add so much thick oil to
	thicken a mixture that you would need bathtubs and
	bathtubs full of 40 wt. to bring a quart of 30 wt.
	up to near 40 wt. You can test this with a cup of
	30 wt. and some 3-in-1.
	This means that topping up with a heavier oil is OK.
	As soon as they mix the viscosity will be what you had
	before.

	2 - The listed viscosities on cans are in fact ranges
	which can OVERLAP! One dealer's 30 wt. might be sold
	as 40 wt. by another!

	3 - Oil breaks down with ( time X high temperature ).
	A major factor in the temperature of an oil in an
	engine is the viscosity. A thicker oil gets hotter
	owing to shear forces than a thinner one. All oils
	break down at the same temperature. Therefore you should
	use the lightest oil recommended by the engine manufacturer.
	Especially after break-in where surfaces are smooth.

	The additives are more important than the viscosity.
	Use only the best grade ( SF ). Also, molybdenum add ins
	work to coat surfaces and protect them during start-up 
	before the circulation system gets oil there. Start-ups
	account for a lot of the wear of a broken-in engine so
	moly is a good bet.

	Joe Weinstein