Quote:
Originally Posted by aieeegrunt
If the 5-40 weight iol doesn't make a big difference when starting I might just stay with the much cheaper 15-40, hell it will allow more frequent oil changes!
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No, you don't want 15w40 dino in there in winter temperatures, unless (a) you have very good compression on at least 3 cylinders, (b) your starter, glowplugs and battery are in absolutely top shape, and (c) the car can be left plugged in with a block heater or a coolant heater (or in a heated garage) all the time on cold days.
There has been considerable discussion on this forum about the practical, extended drain intervals of the newer synthetics like T6. I now run mine for 6-7k miles (I have an ex-US car) with a filter change at 3.5k. With that sort of drain interval, the cost advantage of using conventional with shorter drain intervals disappears.
I have been driving these cars in winter since 1999 in eastern Canada. Trust me, you do NOT want 15w40 dino oil in your crankcase after the second week of December.