Originally Posted by Kurtosis
I will monitor this one closely. In the mean time I will continue gathering data on this issue and post my findings if I feel it might be relevant and or helpful to others. On a side note I had to look up the definition of "deleterious" lol.
Keeping an eye on the oil is a good thing. Stick to well-known brands like Castrol.
Before joining this forum, I had a rough idea of oil grades (my Dad worked in the auto lubrication industry), but have done some reading to keep up with the topic. Bob is the Oil Guy
is worth reading, but tends to provide "Too Much Information". I'm not that Bob, by the way.
I think that the current trend towards lower viscosity oils is somewhat political (fuel saving) and US advice on short oil-change interval is usually regarded as self-serving and somewhat conservative. I do note that the US has some harsh climates, however.
10W-30 oil is increasingly recommended in this country and there is a trend away from the common standard of 15W-40, e.g. Castrol GTX.
Deleterious: "Harmful often in a subtle or unexpected way". -Thought you'd like that one.