Yes absolutely. You will have to change some running gear, engine, engine mounts, gearbox, engine management. It is quite a process, and much modification is required, you are basically putting all the electronics from the e36 into e30.
Yes, physically things fit. A little measuring to get correct driveshaft to fit. Electrically use m50 wiring and DME
Look inside your BMW manual. Usually I put 5W-30 synthetic.
You can put a BMW 525 engine into a BMW 325. The motor mounts will need to be changed. The 525 engine motor mounts will not match the 325 engine compartment.
Suzuki Manual for a 2006 M50 (VL800) States: 3.6 Quarts with filter change 3.2 Quarts without filter change Use 10W40 SF/SG or SH/SJ motor oil
The manufacturer recommends using 10W-30 weight oil in the 2002 BMW. A heavier motor oil can be used in extreme climates.
7-series engine blocks are mechanically compatible, but make sure before you make the switch the two engines are electrically compatible.
I sure wouldn't recommend it. That is a mighty expensive engine to be experimenting with. Go with an SAE approved motor oil or the manufacturer's recommended oil.
Sure, no reason to though. Vise Versa is a lot more practical. However, yes, an 88 can go into a 92. Anything before 96 can be messed around with because that's before emissions testing.
No
depends on what oil your talking about if your changing the motor oil is synthetic oil that must be used. BMW recommends castros synthetic oil but its all your choice on what synthetic oil you want to put in it. i have royal purple in my 325i 2003 and it feels alot better to drive.
In the radiator
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