quote:I really doubt that the average consumer even thinks about it. We are all a bunch of freaks really, to give this much time and thought to it. I worked at an oil change place one summer, and 90% of the people who came in never asked for any particular oil. We put in 10W30 in most cases because it was allowed in the manual of the vast majority of the cars on the road. It was the "no-brainer."
And for good reason. Best overall economy, film strength, and low level of VII's.
quote:Yeah right it will ...in such a case this would bring us back to the original question posed by Oz. I actually asked Mobil1 that same question a while back and they did not answer me, they gave out some other info to avoid the question. I agree with Patman and Molakule. Yes it does provide lower protection. Even in synth (though not as significant). Also has much higher volatility and more smaller molecules. As shown on John S's TGA scans on vwvortex.com. Red Line can admit to this fact, and actually states so on their website. Why can't Mobil1?
A: Mobil 1 5W-30 will protect your car in the summer as well as Mobil 1 10W-30. Your owner's manual specifies 10W-30 above 20º F not because of the heat of summer, but because of the absence of cold. If you use 10W-30, the oil could be too thick to provide adequate protection at start-up for temperatures below 20º F.
quote:What is the CCS viscosity though. I bet one is measured at -25 and the other -30. Also a 0w30 will be measured at -35? I think. My 0w30 has been holding up well, been using it for the last 3 year. Vis acutally went up not down. Barely a 40wt. This is becuase I didin't change the filter at 6 months like I was supposed to. I still say a good 0w30 will outperform a 10w30, does better in the cold, and has about the same high temp protection.
Originally posted by Patman: I 10w30 is -49F, 5w30 is -54F, not much difference there! Or look at Valvoline Synpower, both the 10w30 and 5w30 share the same pour point of -42C! So in that case where is the advantage of using their 5w30??