I recently purchased a 1992 400E w/ 63K. I will be changing the oil and filter this weekend and would like to change to Mobil 1. Is there a problem w/ this change? Further, assuming I switch, how often should I change the oil and filter? Finally, does the old oil have to be drained via a Topsider device from the dipstick tube, or, can you just remove the drain plug from the oil pan and let it drain the old fashioned way? Thanks you any help.

This had been asked four million times in this very forum. Click on "search".

I change my oil via drain plug...no top sider technique for me. a bit messy compared to topsider method but i think u get more junk out by draining the oil hot from plug.

cant help on mobile1 quest/. I still use good old dinosaur juice...15W40.. search the archives, there are some great posts on synth oil ... enjoy your 400e...great machine