Robert,
I was refering to the feel of the car, not of the oil itself. I use Delvac 1300 with 2 quarts of Mobil 1 10W30 and am wondering if I'd actually feel a difference when experimenting with other stuff.

ALex

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1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside