Your smoothest oil

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ST syn 5w-30 was pretty good. ST syn 0w-20 was better. ST syn 5w-20 the best. Vanilla M1 (any flavor except 10w-30 HM) was the worst.
 
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Sep 30, 2020
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Canada, eh?
Rotella T4 15w40
I use it straight in the older machinery and use it as a "supplement" to my other car that spec's 0w20 (IMHO, necessary for vehicles with DI/turbo/small oil sumps).
 
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South Central MN
Rotella 15w40 in the lawn tractor. It feels smoother than straight 30.
Seems like it starts easier and idles smoother.
30 is a bit harder to find at my preferred local store.
 
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Quaker State All Mileage Blend 5W-30 (so far in the Tucson)
Valvoline Synpower 5W-30 (Santa Fe Sport 2.0T)
 
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central europe
with strong engine +- few horses will pass unnoticed.
on weaker engines, change should be obvious.
i remember one article where it says "standard" size car needs only 10kw power on flat road to keep same speed ~45mph.
in other words; to make work all horses together, u need to keep accelerating hard (pedal to metal).
 
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North Minneapolis/St. Paul
In the wife's Elantra for 5w-20 it was Magnatec, 10 decibels quieter than PP on my cheap meter, and for 5w-30 it's QSFS.
My older 98 Tahoe was by far the smoothest/quietist on RGT 5w-30.
The X5 had no change between TPT 5w-30 and QSFS 5w-40.
Mustang GT doesn't seem to care.
 
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