Thanks for thar clarification. I was always wondering if they bored out something in between the 300 and 350.

Sounds like the SEL is just a more advanced system and shuts the door locks faster.

By the way, I did find Diesel locally for $1.49, gas $1.66.

Ride on..

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'89 420 SEL
'90 300 SEL
'84 300 SD (sold it)