Oil change for a e28: which oil?

[mosportgreen66]

I do not know the last time the oil in my BMW was changed. I assume it was a little while ago. Its a nice day so I thought I would change the oil. Before I do so, I just wanted to ask other members what viscosity level they put in their e28 BMW.

This is an original cruiser, no mods done.

Thanks.
-Dan

[Dark Helmet]

M30B34, Castrol GTX 20-50 april-october, nov-march 10-40. factory spec ftw.

[EuroM535i]

Castrol GTX 5-50.....

[gtx510]

I'd use a synthetic, Redline or Motul 5W40.
They cost about$7/qt from thelinks below
www.myoilshop.com
www.motorspot.com


xW50 in the summer and xW40 in the winter sounds perfectly reasonable with an off-the-shelf oil like Castrol Syntec.


And a dose of www.auto-rx.net and www.lubecontrol.com wouldn't hurt either...
It you look thru the Auto-RX FAQ their's a discount code.
wait, here's the link www.auto-rx.com/arxfq.htm

[Wiseguy ON]

Double-Check your owner's manual, you'll find that 15W40 is winter oil and 20W50 is what's preferred at 30F+

[gtx510]

15W40 is a HDEO (Deisel engine oil). Probably all that was out there back then.
A modern 10W40 dino oil should work fine.
Better yet use a modern 5W40 synthetic, most of those are good for turbo-deisels anyhow. And for the most part that's a good thing.

IMHO, a syn 5W40 will probably protect all well as a dino 20W50.
But I prefer synthetics.

The only way to now for sure is to do virgin and used oil analysis.
www.blackstone-labs.com These guys are the BITOG standard. Ask Terry for his opinion....

http://theoildrop.server101.com BITOG Oil forums

[flipstep25]

Castrol GTX 5-50.....

What?!! I thought you used Mobil1 15-50? Oh wait.. that was before the Auto shop stopped ordering it. To bad the oil on the economy is like $25 a liter.

[gtx510]

PS.
Motul and Redline are mostly GrpV, Ester oils.
And esters are better.
They're polar so they stick to metal, and they have a natural cleansing property so they'll clean off old oil varnish.
AND they naturally cause seals (gaskets) to swell which helps control leaks leaks (seepage if you own a British car ).


Auto-RX is a natural ester an helps in all of the above areas.
http://forums.bimmerforums.com/forum...d.php?t=584060

[Dark Helmet]

my only concern is the higher engine speeds when using a "diesel specific" 15-40, as those are the only ones available around here.

[mosportgreen66]

thanks for the reply!

I added 6 quarts of 20w50 anti sludge castrol in the car...

she runs real good.

-Dan

[gtx510]

my only concern is the higher engine speeds when using a "diesel specific" 15-40, as those are the only ones available around here.

You'd think it wouldn't take high rpm's but HDEO's do fine. I think the high HTHS (High Temp-High Shear) numbers help out there.

[rbelton]

I'm using Liqui Moly 10w40 at the moment. Might change that to 20w50 in May in preparation for the hot summer months.

From what I have read the M30 likes the thicker oil due to the wider bearing tolerances vs. the modern cars that need ultra thin oil.



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