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The suffix "M" stands for special design electro. That is the difference...

If the letter "M" was used as a prefix it would indicate for Marine use such as a boat engine....

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āˆ™ 11y ago
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Tony Petruolo

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āˆ™ 2y ago
Quite a bit of difference between TS and the TSM suffix spark plug body and electrode.
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Tony Petruolo

Lvl 1
āˆ™ 2y ago
What is the prefix ā€œCā€ stand for on the AC Delco plug?

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Q: What is the difference between cr43tsm and cr43ts spark plugs?
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