Description

Spark Plug (Professional™ Double Platinum)
Center Electrode: Copper core with double platinum pads for enhanced durability and consistent ignition
Suppressor Seal: One-piece, fired-in, multi-glass seal to reduce radio-frequency interference and prevent combustion leakage
Insulator: Ribless design improves boot-to-plug seal for optimized performanc
Fitment & Vehicle Compatibility
Commonly used in various GM and non-GM vehicles, including:

4.1–4.6 L V8 Cadillac (Eldorado, DeVille, Seville, Allante)
3.8 L V6 Buick Riviera, Pontiac Bonneville, Oldsmobile models
See cross-reference listings for full vehicle compatibility
Cross-Reference Equivalent Part Numbers
Other spark plugs with similar specifications include:

Autolite: APP606
Bosch: HR9DPX
Champion: RS14PYP6
Denso: Models 5070, 5325, IT16, PT16EPR‑L13, VT16
Motorcraft/GM: 5614248, AGSF42C‑6
NGK: TR5‑1VX, TR55, TR55VX, BPR5EFS equivalents (various)
Plus others listed on cross-reference sites