If you are running dino, don't attempt extended drains, just change at 3-5kmi and use good stuff like Delvac-1300, etc. Oil analysis is recommended for extended drain intervals (to ensure you're not going past the oil's useful life), or if you just want to keep track of the general condition of your internals by watching the PPM's of various metals, etc. I have analysis done at every change on my diesel and E500, but don't bother doing analysis on any of my other vehicles. (I used to do it on the W123 while I owned it... interesting to compare the 617 and 603 data!).
Anyway, OK Don, with a new-to-you car, it wouldn't hurt to get an analysis done on whatever is in the crankcase now, when you drian it & before refilling with M-1. But, it's not critical either. Depends if you don't mind spending the extra $20. =) -dm > ------------------------------ > Date: Wed, 22 Feb 2006 08:26:44 -0600 > From: "Donald Snook" <[EMAIL PROTECTED]> > Subject: Re: [MBZ] Oil CHange > >> Ok Don wrote: >> >> "I'll find out this coming weekend - going to change the oil in the '90 >> 300D 2.5. It will be the first one since I took responsibility for it's >> care and maintenance. I have to decide whether to get an analysis of the >> old oil before I switch it to Mobil 1." > > It has dino 15-40 in it now. I DO NOT want to start another oil thread, > but as I understand it, if you have dino oil, there is not really any > good reason to change it at extended intervals or worry about the soot > content. Did your mysterious running problem fix itself? Just bad > fuel? > > > > Donald H. Snook > > 1990 300SEL
