Quote:
Originally Posted by WD8CDH
Even a 0W40 will be thicker than a straight 30 weight oil at operating temperature.
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Very true, the concern is whether the 0W40 is adequate when cold. The 5W40 is quite thin when cold and does a very good job for starting in cold ambient temperatures. IMHO, 0W40 is overkill for a 616/617 and the Mobil 1 5W40 has much better diesel specs anyway. The only disadvantage of 5W40 is availability.