On Mon, 13 Feb 2006 21:18:25 -0000, "Huw"
<hedydd[nospam]@tiscali.co.uk> wrote:
>The main drawback is that multifleet [mixed petrol and diesel] heavy duty
>oils are mainly available as 15w/40 viscosity which is not always suitable
>for all engines. Apart from the viscosity this type of oil is superior in
>many ways to lesser synthetics.
>
>Huw
>
It is suitable for most vehicles in all but the coldest conditions if
you are not worried about the last little bit of fuel economy. Even on
my 3.8 Pontiac, which recommends SAE 5W30 API SH oil, 15W40 is
perfectly acceptable to -7C or +20F without engine pre-heat.
During the winter it could be just a tad on the heavy side, but I use
10W40, which even according to GM tables is acceptable to -20C (even
though they say never to use 10W40 - but allow 10W30 - which makes no
sense at all - don't even start talking about the supposed shear
induced viscosity breakdown in 10W40 oils)
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