Porsche Spark Plug NGK 99917012891

The Porsche Spark Plug NGK 99917012891 is a direct OE supplier solution manufactured by NGK and referenced by part number 3981. This spark plug is engineered to meet or exceed the original specifications for select classic Porsche 911 models, including fitment across 1965–1972 and Turbo/Turbo Carrera models through 1989, as specified in the verified fitment summary. It serves as the current solution for the discontinued Bosch W-3-DP0 plug (NLA from Bosch & Porsche).

Key Features:

• Direct replacement for OE part number 999 170 128 91 / 99917012891
• Manufactured by NGK, a leading OE supplier
• Verified fitment for Porsche 911 models from 1965–1972 (various submodels and engines), 911 Turbo Carrera (1976–1977), and select 911/930 Turbo models (1978–1989)
• Not an OEM part; serves as an OE supplier solution

Choose the NGK 99917012891 spark plug for assured compatibility and reliable performance on classic and turbocharged Porsche models that require precise ignition specifications.