Oil squirters were included in production of the L-engine, which started in 1993. If you look at the paper tag on your timing belt cover, it will have a line of numbers like this:
Eng #######-L B230F NR####

That first group of seven digits, with the -L suffix, indicates the L engine.

Actually, the oil passages for the oil squirter system were in the block of earlier engines, but were blocked off. Some clever engine guys have been able to drill out access and installed oil squirters in earlier engines, especially if they were modifying the engine for higher output (higher compression, or turbocharging, etc.). But the oil squirters were OEM only in 1993 for the 240, and a couple of more years in other models (e.g., 7 or 900's) that still had red blocks.

The purpose of the squirters was, of course, to cool the piston and reduce piston ring and cylinder wear, including the 'piston slap' common in the B230 because it had shorter, lighter weight pistons (to increase fuel mileage) -- the shorter piston skirt allowed the piston to "wobble" (for lack of a better word) in the cylinder bore, causing the "slap" effect.