What kind of oil should i put in my 1990 535i M30 Engine?

[pundit]

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Here in Australia I use Mobil 1 5W-50 in my M30.
I'm not sure if it's available in other countries or not.
I wouldn't use it it later higher-tech engines but I think it suits the older M30's with a few miles on them just fine.

[Dash01]

If your oil pressure light is coming on:

1. Take the sender out and wipe it off, then put it back on. See if that helps.

2. Replace the sender for ~$6 at BMA. See if that helps.

3. Try thicker oil.

Cheaper oil makes more frequent oil changes affordable, whereas synthetic oil is an expensive habit, so you'll be tempted to let it slide. If you bring them the filter, WalMart will change your oil for ~$13, viscousity of your choice, ifn you don't wanna get messy. If your oil is low but needs changing, add a quart of auto transmission fluid to top it off and run that way for a few days. The tranny fluid will flush alot of crud out of the engine, but don't run it long that way cuz you don't want that crud in suspension for very long.

[diamond777]

transmission fluid i am pretty sure is for the transmission.just a thought

[Blitzkrieg Bob]

but recently swiched to Astrolube.

[aston_jag_tech]

20w50

[DABIMR]

20w50

That's what I use Castrol GTX 20W50, in the green plastic bottles..

[Paul in NZ]

well i must be the odd one out.The bmw dealer here would put in castrol 5w 30 synthetic,so thats what i use.It doesnt get too cold here or too hot.I like the light weight at start up,thats when all the engine wear occurs.I run the oil for the full service interval,and always change the filter.

[BillionPa]

..... thicker oil lowers oil pressure.

[winfred]

if you say so

..... thicker oil lowers oil pressure.

[Blitzkrieg Bob]

must have slept during that class