I put 5W30 Mobil Synthetic in my 1992 w124 250D (OM602) after my trusted mechanic and local racing parts store recommended it.

My other mechanic friend says I did a BAD thing, that the oil is too thin and might cause engine damage.

Should I drain the oil???

I'm thinking of putting in AMSOIL 15W40 Synthetic.

Help!

Thanks in advance for any help.

Chris in Vancouver, BC

1967 230 (110)
1992 250D (w124)