QSUD 5W-30 - Winter performance

[jaynissan12]

Ok, I will accept and agree with that but correct me if I am wrong here, isn't some of the complaints here about the speed at which the engine does turn over or if it even bothers to turn over or not. In that case viscosity or flow matters a whole [censored] of a lot. I did mention lifter/valvetrain as being directly affected by the viscosity difference when it is cold vs warm as well, taking longer to pressurize the lifters etc.

Maybe flow as I used the term was not the best word, but it still isn't incorrect in my use either.

 

[bigt61]

When it's cold, pumps go into bypass all the time. They can't physically move the heavy oil without shearing the pump drive shaft off. As the oil warms up, they move more. I started my SBC race car one time in 30F weather (Road Atlanta - October morning) and I had 5 lbs of oil pressure. After it warmed up, it was about 35 lbs at a 1500rpm idle. This was straight 50 Kendall. That was the last time I ever used straight weight - 20W-50 after that.

 

[Shannow]

bigt61...that's a misapplication of the "W" rating...particularly as your oil didn't have a "W" rating

Really not pertinent to the "fine lines within 5W" being discussed (or the "30" at the hot end of the equation really).

 

[Garak]

Yep, several people must re-read SAE J300.

 

[Boss302fan]

It is -20 here today(Wisconsin) and QSUD syn 5W20 works great in my wife's 2011 Hyundai Santa Fe V6. Very smooth and quieter compared to other oils I have used(Mobil 1 EP, PP, Ultra)in this vehicle...

 

[Swift101]

Thanks everyone for the input and comments. After reading everyone's posts and doing some more research I'm positive this oil can handle cold temps.

On a side note I was running M1 0W-40 before this and it felt about the same as QSUD at below freezing temperatures.