Quote:
Originally Posted by Joe's Garage
That's why we posted it.
And, by the way, we've been running Valvoline 20W-50 in various engines since 1975.....never EVER had an oil-related issue.
Still have a couple of cardboard 'cans' of the old stuff from before 1980 here somewhere.......
Good luck!
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#1 you are in hot las vegas... running a conventional 20/50 in colder climates, anything below about 50f & the engine will let you know the oil is too thick at start up...
#2, nobody is suggesting an engine will blow up from using 20/50, the point is why use that thick of an oil in a "street" built engine with tighter bearing clearances? GM nor any other engine calls for 20/50 in an engine built mainly for street use... yes some guys have cars on the street that are built closer to race engine tolerances & some builders suggest using it, but in the majority of real street engines, there is no advantage to using that thick of oil. thicker oil doesnt flow in & out of tight bearing clearances as well as a 10/40 or 10/30 & that means it doesnt cool as well as a thinner oil. & during start up there is no question that it doesnt flow as well & can contribute to more wear.
i should state that some synthetics do cold pour as good as some thinner conventional oils, but when comparing apples to apples of the same type of oil, a 20/50 conventional to a 10/30 conv, there is a big difference. & when warmed up you simply dont need a 50 weight oil on a cruise to a car show or even some occasional runs down the track.
as we all know you will get all kinds of opinions on oils, the points i mentioned are not opinion they are facts... use what oil you want, but do some research before following myths or thinking you need huge levels of zddp or molasses thick oil for your street engine.