What grade/type oil in 740 with 200k miles?

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jamiebabineaux@gmail.com - 22 Feb 2006 16:13 GMT

I did a search here, but unable to find a good answer. It appears as if
I will have to machine my crankshaft to the next level - mechanic says
.010". I'll get new bearings also I assume.

Just curious, do you all normally keep using the original oil weight
from when the car is new, or do you go to a heavier weight or something
like synthetic with higher miles?

I have a 1987 non-turbo 740 GLE with the B230F engine and 196,000
miles.

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jamiebabineaux@gmail.com - 22 Feb 2006 16:15 GMT

FYI: this site is amazing:

http://www.bobistheoilguy.com/

I like the bearing wear analysis and the viscosity chart

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Dlee - 22 Feb 2006 21:47 GMT

Assuming you get the whole motor done, you basically have a new motor
with tolerances equivalent to new. Use the same oil as recommended for
a new car.
HTH

> I did a search here, but unable to find a good answer. It appears as if
> I will have to machine my crankshaft to the next level - mechanic says
[quoted text clipped - 6 lines]
> I have a 1987 non-turbo 740 GLE with the B230F engine and 196,000
> miles.

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zencraps@comcast.net - 22 Feb 2006 22:11 GMT

FWIW, when I rebuilt the engine in my 244 Turbo, I stuck with 10W-30
(except 5W-30 in the mild winter), and change the filter and oil very
frequently.

Frequent oil changes is the best bang for your buck.

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jamiebabineaux@gmail.com - 23 Feb 2006 03:59 GMT

Can anyone vouch for Auto-Rx? This was recommended by an oil "expert"
to clean a dirty engine.

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