Originally Posted By: j12
Well, earlier this evening I tried an Autozone and two Walmarts. All 3 stores were out of stock of the 0W-40.
The comment about the relationship between lifter tick and oil viscosity is very helpful. I definitely notice it more after driving hard, or after an Autox run. Im going to try the Castrol 0w-40 (will buy through Amazon). If Im still getting tick I will look for something more Viscous at 100 centigrade. Perhaps a 5W-40 or or 50 weight. What's the consensus on Motul 8100 X-Cess 5W-40?
I've heard people say that older cars tend to develop restriction in the oil passages, and a thicker oil can cause increased oil pressure. But I have also heard that older cars lose some of the tolerance (piston rings?) and tend to require thicker oils to compensate. Can someone clear this up? I don't have an oil pressure sensor on my car.
If you're doing a lot of track stuff with an E36, it's probably time to get a little data in the car anyways. Either regular gauges (coolant temp, oil temp, oil pressure) or a cheap data system like a Race Capture. I'm sure you're well aware that the coolant temp gauge is buffered, and is essentially no better than an idiot light. Use oil temp & pressure to dictate what viscosity oil you run. Pop your valve cover and look inside. If it's fairly clean, then there is no 'oil restriction' to speak of. These engines have little to no main bearing wear, but depending on how they've been treated are known to wear rod bearings a bit. As another poster said, a baffled pan is a good idea, and I'd absolutely consider dropping the pan and safety wiring or tack welding the oil pump nut in place. If the pan is coming off, get a baffle from somebody like Turner or Achilles Motorsports. And if the pan isn't baffled - run your oil on track at .5-1 full quart over full to help prevent oil starvation. The effects of running over-full are nill compared to losing oil pressure in a high-G turns or braking (very common, for example, braking into T10a at Road Atlanta), these engines have an oil separator plate bolted to the main caps to help prevent oil churning by the crankshaft.
Any of the oils listed are good oils. For your question specifically about the 8100 X-Cess, I stock the 5W-40 for all the streetcars that we do. It's high quality and LL-01 approved, and I don't have to worry about any issues if it's a daily driver going 10k miles or getting autox'd the next day. Every engine is going to behave a little differently wrt what oil it prefers. A lot of it has to do with how they were treated in the beginning of their life by their dopey owners. Did they do 15-20k mile oil changes with junk BW 5w30 dealer oil for the first 100k? Or did somebody actually take care of them? Oil analysis, and temp/pressure readings should be what sets your oil range. Stop worrying about the specs. It's a nice starter to get you in the range of where you should be, but temp & pressure are key.