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

[oleh]

What kind of oil should i put in my 1990 535i M30 Engine, I want to have a good oil pressure, when i put 5W 30 the oil pressure light kept on coming on when the engine heat was at half.

[632 Regal]

synthetic mobil 1 0w-40 if you can find it is the top choice of most people here.

[oleh]

synthetic mobil 1 0w-40 if you can find it is the top choice of most people here.

I tryed looking for that one for some reason i cant find any here in canada seems to be rare

[Russell]

a synthetic 5-40 is also a good choice. There are several brands in the US . Not sure about Canada. I am currently using Castrol Syntec 5w50. No issues.

[632 Regal]

I had to mix a few of the 5w-50 with the M1 last change. Just looked for more and now thats not anywhere lol...what a conspiracy. Sorta have a 2.5w-45 goin on.

a synthetic 5-40 is also a good choice. There are several brands in the US . Not sure about Canada. I am currently using Castrol Syntec 5w50. No issues.

[we_call_him_doher]

I guess I'm one of the few people using good ole non-synthetic Castrol 20W-50

[Adnan]

I guess I'm one of the few people using good ole non-synthetic Castrol 20W-50

Me too. Oil and filter change every 3000 miles.

Adnan

[Robert K]

When I bought my 1991 535i about 7 years ago, I called the dealership and asked them what oil they would put in it if I brought it in for an oil change. They said BMW 20W-50. Then he proceeded to tell me that Castrol packaged the BMW oil. So, I've put Castrol GTX 20W-50 in my engine ever since. I started with 67,000 miles and now have 147,000. I've had no problems at all. Frankly, I think full synthetic is overkill and a waste of money for standard engines. I mean, the BMW engineers think it's okay for the oil service light to come on up to 9-10,000 miles between changes WITH standard oil. How many people do you know who change their non-synthetic oil every 3-4,000 miles and have had oil related problems? I don't know of anyone personally. A person would probably be better to stick with regular oil and use the savings to buy a pressure luber that builds oil pressure in the engine before allowing the engine starter to engage. Who knows, your engine might last forever.

Grace and peace,

Robert K
1991 535i

[winfred]

i like a thicker oil on the m20/30 motors, i ran castroil gtx 20w50 in my 535 and till the last change in my 325 (45k miles in the 535 and 80k miles in the 325 on castroil), but i decided to try the delo 400 15w40 i run in the diesel and it probably cut the valve train noise by a good 30%, the weight difference is not enough to account for the sound, besides 10wxx usually makes them noisy in our heat, i suspect it's the difference in the standards that the delo is rated for, like compression ignition engines where castroil is only rated for spark ignition

[M20Turbo]

I have been using Redline 15-50 with the addition of the turbo.