Kevin Dawson wrote:
>
> Hi all,
>      My Dad still has a 2.1 in his 87' Westy and he wants to know what grade
> of oil to use.  So I tell him 20-50wt.  He tells me that according to the
> Bentley manual 20-50wt does not cover our temperature range, seems to top out
> at about 100 F.  We live in the Inland Empire of Southern California with
> summer temps of 60 F as a low to 115 F as a high.  The chart would seem to
> show that straight 40 wt is the correct oil but 40 wt only goes to a low of
> 70 F.  So what are you guys using in hot climates?
> Thanks,
> Kevin

Two things-

- Older oils are not as good as the formulas produced today. That
effects the temp range in your chart. 20w50 is not too thick for 60
degrees F in my humble opinion. I would not use a single grade/weight
oil though because of the range of degrees you need to cover.

- Which leads to the next point, Synthetic oils can come in 15w50 and
are much more stable at higher running temps so go for some Mobil 1 red
cap.

TBerk