quote:Great question. But the qualifying statement in your question is "since a good 5w30 synthetic will not thin out". If the oil is good quality, I don't forsee much difference at all. Howerver, as we all know better here at BITOG not all "synth's" are made equal, thus relying in VIIs to do the work on cheaper 5w synth's would mean it would thin out quicker than the 10w version of the same oil. I'll stick with good synth in a 5w-30 flavor. Unless of course, the engine makes noises (such as piston slap, etc), then it's time go thicker or change brands.
Originally posted by Patman: I want to turn this around the other way, since I'm really curious as to people's thoughts on this: What advantages do a 10w30 synthetic have over a 5w30 synthetic? I say none, since a good 5w30 synthetic will not thin out.
quote:Well that's true. But a 5W-30 is 60 cSt at 40 F and 10W-30 is 65 cSt at the same tmperature. The difference between 0W and 5W is too little to see on the graph. As far as the advantage of 10W-30 over 5W-30 probably about the same advantage 5W is in viscosity over the 10W at 40 F (Little to none ) But the 10W 30 would have little to no VI Improvers-and I just like that idea. But in the end its all irrelevant to me as I am in the process of going exclusively to Schaeffer's 10W-30 Blend
Originally posted by Patman:quote:Even if it only gets down to 40 or 50, the 5w30 could help.
Originally posted by Al: But in Texas there is simply no need for a 5W oil (IMHO)
quote:This is exactly what I'm doing, not only in my own car, but my entire family's cars! (wife, mom and dad, and sister until she sold her car and moved west)
EDIT: I want to change my statement slighty. Why not just stick with a quality 0W-30 and skip the other two, regarless of weather?