Re: Would 15W40 be too heavy for my H??

Posted by JPY on February 23, 2004 at 14:27:07 from (216.2.105.70):

In Reply to: Would 15W40 be too heavy for my H?? posted by John on February 22, 2004 at 19:12:08:

Multiviscosity oils are not naturally occuring hydrocarbons. the range is created by additives that break down over time. Therefore a 15W-40 oil as it is heated and ground against parts will become a 15W-35 then a 15W30 and so on. The drift is always to the lower number. Streight weights are natural temperature cuts and tend to stay true so say 30W may become 29 W but it is a longer term process. Fortunately something between 20W and 30w always has enough lubricity to do the job and therefore they work as well as the multigrades in that same range. Buy the lowest cost recognized suppliers oil.

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