Your smoothest oil

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Super Tech syn 5w30 was pretty good. Super Tech syn 0w-20 was better. Super Tech syn 5w-20 the best. Vanilla M1 (any flavor except 10w30 HM) was the worst.
 
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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).
 
Quaker State Ultimate Durability was always the quietest for me. Unfortunately I'm a deal whore so I only buy it when I need it which is rarely.
 
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).
 
In the wife's Elantra for 5w-20 it was Magnatec, 10 decibels quieter than PP on my cheap meter, and for 5w30 it's Quaker State Full Synthetic.
My older 98 Tahoe was by far the smoothest/quietist on RGT 5w30.
The X5 had no change between TPT 5w30 and Quaker State Full Synthetic 5w-40.
Mustang GT doesn't seem to care.
 
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