I'm just curious because I've never seen an engine drain plug on a Benz that required a Hex bit. All that I've seen have been basically drain "bolts." If you do anything at all, you should have a 14MM wrench that fits.

If you do indeed need a 14MM hex bit, you can get a set at AutoZone with a 12, 14 and 17 for very little. They will be a good purchase, because you usually need the 14 for the rear axle and manual transmission drain and fill plugs.

Is this an aftermarket drain plug?

Just curious,

My 560SL has the 14mm hex drain plug. It's not an aftermarket plug. I've only had the 300SEL for less than a month, just got the oil filters in, so I'll be changing it this weekend. Haven't checked the drain plug on that one yet.

Been to two different AutoZones (which my non-Mercedes mechanic hates), as well as many other auto parts stores, Sears, and Home Depot. Can't find them anywhere. I've seen a Hazet online for ~$16. 14mm only.

Yes, I still need to solve the rear axle lubricant problem. I think the interval on that is 100,000 miles, so I might just take that to my mechanic instead of buying the tools. Or maybe not. Haven't decided yet.

In the meantime, I've already used my Topsider a few times and will again this weekend. Since the filter on my 560SL is underneath, I still have to get under the car (and do a visual inspection).