Quote:
Originally Posted by cornemuse
I have always only used 30 w oil in 'all' cars I have ever owned. 'Here' is socal coastal, and it snowed here the year I was born & once again in 1967. Never had a hard frost (frost is rare anyway) (rarer than rain!) I've never had the need for multi-vis oils. Originally Valvoline (old label =API CC) then to Pennzoil (old CD). Never any problems
53 chev actually used reclaimed oil 11 cents a quart!
67 VW (about 5 bugs & buses)
75 ford pu
79 VW Rabbit diesel (x2)
82 chev 6.2 d (x2)
84 MB 300 TD
84 chev blazer 6.2
83 MB 300cd
& a few others
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On a hot day what is your oil pressure at idle? The older diesels may preffer straight 40 grade diesel rated if you can aquire it for the same price. Thirty weight in older diesels is different than thirty weight in modern diesels.
I can see no harm in using the 40 weight. If the weather did not swing so bad temperature wise where I live Single grade oils would be in some of my cars.