Best oil weight

[rocco16v at netzero.net (L F)]

Remember:  A multi-weight oil (i.e. 20w-50 or 10w-30) is never any more viscous than the first/smaller number. 
A multi-weight oil starts with a stock that has the same viscosity as a straight-weight oil with the first/lower number, then has additives put in that prevent thinning out any further than a straight-weight oil of the last/higher number.
Therefore, a 10w-30 has the cold viscosity of a cold 10weight oil (because it IS a 10weight oil), and the hot viscosity of a hot 30weight oil (because of the properties of its additives).
  The oil experts recommend against multi-weights with a difference between the two numbers of more than 30.  i.e. at 20w-50 is okay, but a 10w-50 is asking for too much of the additives and may not give you the protection of, say, a 10w-40.  Comprende'?
Several oil company sites have good insight on how to choose a suitable lubricant for your 16V VW engine.  Most of them do not recommend using the 8v engine in any VW model.
....:)

Larry
sandiego16v

  ----- Original Message ----- 
  From: Captnbr@aol.com 
  To: Scirocco-L@scirocco.org 
  Sent: Thursday, May 15, 2003 7:10 PM
  Subject: Re: Best oil weight


  I use 20w-50 all year round in the 16v, im in south Florida.  I use 10w-30 in the Vr6 but im wondering if I should switch to 20-50 for the summer or will that be too thick for the Vr?

  Brian 86 16v
  98 Jetta Vr6

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