Matthew,

On my high mileage engine the light will flicker if the oil is too
thin.  I run mineral based 20w-50 oil and use the Mahle or Mann
filters.  Sometimes the synthetics are "physically" too thin for a high
mileage engine, or any engine with some bearing wear. Their better (and
purer) molecular structure allows them to be physically thinner for the
same weight rating, which is performance based (by testing), not actual
physical viscosity.  This gives them the benefit of slightly better gas
mileage as well.

Mineral based oils with a rating of 20w-50 are more viscous than a
synthetic rated 10w-50, and will give you higher oil pressure.  It might
be time to change oil types.
--
Stuart MacMillan
Manager, Case Program
800-909-8244 ext. 8208

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