911 Carrera 4 Cabriolet AWD F6-3600cc 3.6L SOHC (1990)
ATTENTION:
Service Manager/Service Technician
This bulletin supersedes Technical Bulletin Group 1, Number 8905, Book F, pages 35 - 36.
Models Affected:
All
Concern:
Cars operated in certain areas of the U.S. are more prone to carbon formation on the intake valves than in others.
General Information:
The following engine oils have been tested and found to contribute less to this carbon build-up. Use of one of these oils may prove helpful in cars
operated in these areas of the country.