new owner of 1981 MB 240d - Page 2 - PeachParts Mercedes-Benz Forum

t walgamuth · #16 05-20-2006, 05:10 PM

yep

i agree.

tom w

rkerste219 · #17 05-20-2006, 05:12 PM

Quote:

Originally Posted by Craig

This is a handy tire size calculator for comparing different sizes:

http://www.miata.net/garage/tirecalc.html

According to the manual for my 240D, the original tire size was 175 SR-14 (similar to 175/80-14). Your new tires are 185/70-14, which are 3.3% smaller diameter than stock. This corresponds to the speedometer error that you measured 2.5/2.42=1.033. I use 185/75-14 on my 240D, which are a little taller and almost identical to the stock diameter. Personally, I don't think 3% is a big deal. What you have done is reduced you final gear ratio a little, which will give up a little better low end performance and limit your top speed a little. I would just use the tires you bought and decide if you want to do something different next time. Also, I would keep an eye on the front tire wear, some chain stores don't really know how to do a proper alignment on a benz.

thanks,

next time I will try and remember to get 185/74/R14. I am new at all this.

rkerste219 · #18 05-21-2006, 07:44 AM

Thanks to all who have posted stuff for me. What did people do prior to the internet??

Anyway,

I now am worried about oil, oil filters, fuel filters. Prior to reading all the other “Posts” , I would just go to my local auto parts store and just buy oil, filter etc, with out much thought as where or how good the item I am buying.

On my Isuzu, I used Shell 15w/40 for the last 3 or 4 hundred thousand miles. After the price rose to over 8 dollars a gallon, I started using Coastal 15w/40 . I did check to make sure the “C” and “D” ratings were the same as Shell. After reading several different ‘Posts’, I am going back to Shell for both the Isuzu and the 240d.

Now oil filters …………… when Autozone and Advance Auto stopped stocking the oil filter for the Isuzu, I now buy from NAPA. But at 22.00 per filter, I am still looking for something cheaper. After buying the 240d, I went to Advance Auto and came out with Purlator oil filter and fuel filters (primary and secondary). Now, I am not sure if Purlator is a good brand.

Bottom line, would like to know what brand of oil, oil filters, and fuel filters other 240d owners use.

Bob

t walgamuth · #19 05-21-2006, 08:21 AM

before the internet, we had to learn it on our own, from our dads, from the neighbor, or from books. it took a lot longer, but there was a lot less to know back then. cars are a lot more complex now.

my first car, a 1960 simca aronde had a pushrod four with a one barrel carburator, a four on the tree shifter, excellent nimble handling, and most important to a horney teenager with grand ideas, reclining front seats!

good thing it was easy to work on cause it was a pos quality wise. i rebuilt the tranny twice, the motor once and swapped the motor once. kindof a constant demonstration device for beginning auto repair!

tom w