09 What do those "20W50" numbers mean for my engine oil?
Description
This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.
09 What do those "20W50" numbers mean for my engine oil?
A: That's the viscosity range of the oil, i.e., how thick it is.
20W means that this oil behaves exactly like a 20 weight oil at 0F,
and behaves like a thicker 50 weight oil at 210F.
This type of oil is called a multi-viscosity oil because it is capable
of lubricating your engine under a wide range of temperature conditions.
More details are available at the various oil co web sites, and on
the oil FAQ available on many sites.
See also your owner's manual and further below on the recommended oil
weights to use for your car.
There are two opposing views on weight to choose. One says
to get as thin as possible (to pump better, especially at start up),
the other as thick as possible (better bearing protection).
Typically, manufacturers have specific recommendations depending
on the climate you live in. Contrary to other small engines, VWs
seem to like thicker oils better. Synthetics generally offer the
best protection. See the FAQ on that as well.
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