Ryan wrote:Just to clear up whoever quoted me a few posts up, I'm not entirely sure that a 40 oil performs just as well as a 30 oil at whatever temp 30 means. I don't think thats right... its probably comparable, but not exactly right. We'd be assuming that viscosity vs heat is a linear relationship, which it probably isn't.
If that graph is right, it screws with my understanding a bit.... I wish they also had lines for the separate W ratings.
I see. It would be nice to know the independant and dependant variables of this graph then maybe I can analyse it better??????
Simple. ANY viscosity will work properly, depending on engine temperature. As stated in BITOG, engines are designed for a viscosity of 10 centistokes. So, for a normal street car, that works around 210-230F, you need to use 30 weight. If your engine were to work at 190F, you'd need 20 weight. If you're racing the car, you'd need either 40 weight (250F), 50 weight (270F) or whatever viscosity will give you 10 psi per 1000rpm, at normal operating temp.
mikeetown wrote:anyway. This post & forum will help a lot of people if they can read past the bickering haha.
I personally want to thank everyone who's come forward with information on this topic. I did have a few questions initially, and I've had them all adequately answered! You guys are the best. I doubt I would know half what I do today about these cars without you!
Happy Holidays too, I didn't post anything on Thanksgiving!
I'd say thats a poor oil choice. Much too thick at start up and much too thick when running.
Now with Moderator power!
Black '93 BP RS - wrecked, parted, scrapped.
Green GS - Sold.
Black GS - Summer DD/Race car - Fancy KLZE
Red GS - K8-ATX -> MTX-KLDE - Frakencar. Scrapped
White GS - Rusty. Parts. Scrapped
1997 BMW M3 - my summer baby
2002 BMW 325Xi - sold
2003 Forester Xti - EJ20K swapped. Feedback
well, the loud friction gear noise went 80% away. Also, it had better pickup probably cause then engine after 285,000km needed better cussion between rings. It just felt good. ALso, then engine ran cooler. It not something i would recommended to someone with a 200,000km engine. Since it never went below 18 degrees celcius in summer and and was like 35+ all day, i thought it might help me consume less oil until my swap. Basicly, didnt care at this point.
mikeetown 93 Black GS - J-spec KLDE, CLEAN CAR 92 Red GS - J-spec K8ZE, stripped interior - Written off 2004 Infinity G35 Track Edition - 6 speed manual viewtopic.php?f=17&t=79142
Ryan made a good guide on replacing those, I'll be doing that before my own swap, along with far too many other things. Basically, I don't want to pull it back out for something small I simply didn't remember to do. Bleh, my list grows daily.
