Comments by "flagmichael" (@flagmichael) on "How to maintain your Toyota Part 1 : Engine oil and Filters" video.

My own personal take on changing viscosity is that the original is probably best for the life of the engine (I know many people disagree- this is just my take on it.) Viscosity is selected to match bearing oil clearance; the new 0W-16 oil is really thin to flood the new tighter tolerance bearings. See https://blog.k1technologies.com/bearing-clearance-and-oil-viscosity-explained for an older range of clearances. There is a popular theory that the bearing clearances increase as the bearings wear, but I doubt that. I rebuilt an old Volvo engine with 190K miles on it and the clearances, according to Plastigage, were still in tolerance. All that said, the only difference in 0W-20 and 5W-20 is in cold viscosity, which is more of an issue in places where it gets really cold in winter. Once you get on the road it all becomes the same very rapidly.
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Great advice! For hybrids, ChrisFix has a part of his video on replacing a 2nd gen Prius battery that addresses cleaning the hybrid battery cooling fan as well while the area is apart: https://youtu.be/Q3RCdrh666w?t=522
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@TheCarCareNut I appreciate the info! I have not had a real answer to the question about break-in oil for today's cars. Not very long ago there was a recommendation not to use synthetic oil for break-in periods. It's hard to know what to believe.
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@TheCarCareNut A friend fell into that trap. Had receipts for oil but nothing to demonstrate he used the oil in that car, or when.
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