27 Apr 12 18:38, Mark Hofmann wrote to Roy Witt:



 RW>> He was looking for a thicker oil than the 5w-40 that he had been
 RW>> using.
 RW>>
 RW>> Where he lives, he could use a 20w-50 and get the same desired
 RW>> effect.
 RW>>
 RW>> What he's trying to do is lower the possibility of that noisy lifter
 RW>> leaking down. Going to a heavier viscosity might be the answer to
 RW>> less leak down.

 MH> I'm starting to wonder if the opposite might be what I want.  The
 MH> main reason being that I don't get the noisy lifter (cold tap) when
 MH> the weather is warm or hot.  The cold mornings, it does it the most
 MH> and loudest.  On a hot summer day, a cold start makes little to no
 MH> noise.

 MH> Since the heat should be making the oil thinner, I would think that
 MH> might be the way to go.

If you're using a multi-weight oil, think viscosity. i.e. with 10w-30,
think of the 10w viscosity as winter flow. Today's multi-weight oils are
tested for flow at controlled tempuratures, the 10w meaning that the oil
will flow like a 10 weight oil at a cold temp such as is encountered in
the winter time.

The 30 in that nomenclature means that the oil will flow (viscosity) like
a 30 weight oil at a higher temp. So, the warmer 10w-30 oil gets, the
closer to the viscosity of a 30 weight oil, rather than that of a 10
weight oil.

When you park the car overnight, the warm engine temp will keep that
leaky lifter from leaking down for a longer period of time, hopefully
keeping its 30 weight or heavier viscosity longer. If its a garage kept
vehicle, it may not get cold enough to thin out the viscosity and keep the
lifter pumped.


                R\%/itt


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