What is the difference between marine spark plug and a auto spark plug?
What is the difference between marine spark plug and a auto spark plug?
Ayuh,..... Depends,.....
With AC Delco, for the Chevy motors, the auto plug is R43T, a steel bodied plug,....
The Marine version is MR43T, an alloy bodied plug, much less prone to Rust,....
Any Grease is Better,... Than No grease at All....
And less prone to meld with a cast aluminum head. However, it's still a good practice to pull the plugs and inspect every season. Then when you re-install put a light coat of high-temp grease on the threads.
CHawk 25 DLX
The plating on the metal shell....in the better quality plugs.....