Here is a quote from pedaltothemetal in the oils to avoid thread
quote:Here is an observation by my Porsche mechanic friend who drives a VW Corrado:
Last month local SCCA meeting had a guest speaker from a local race engine builder. A length discussion came up about oil and after pretty extensive testing they have found that Mobil 1 heats up even more than some conventional oils. Pressure drops have occured at high RPM's also. Not to mention oil burn off and poor flow characteristics compared to other oils. They recommended Amsoil, Royal Purple, or Redline. Or for a conventional oil Valvoline racing oil. Also something worth noting for you highly modified engine guys is that after becoming fuel saturated Mobil 1 was one of the worst oils even compared to other conventional oils. I know of 3 engines in autocross cars that have blown. They were all using Mobil 1. One of those engines was mine.
quote:I ran M1 15W-50 in a BMW M3 motored 318ti and E30 325, will switch to Amsoil 20W-50 this weekend for the summer, and later 0W-30 for the winter.
well for the past year I've been running Castrol GTX 20W50 in Baby. My oil temps have been in the 220's when it's cold out and 230's when hot (above 70 degrees). I just switched to Amsoil 20W50 and what a difference. Cold temps dropped to low 2 teens and hot temps barely reach 220. An added note, I was running Mobil 1 before the Castrol, and my oil temps were in the 230's on cold days and upwards of 250 on hot days. Just wanted to let y'all know that Amsoil seems to be the real deal. It's more expensive than Mobil 1 and dino, but the temp difference makes it worth it to me. And just so you know, Baby just turned 190K on a factory stock bottom end (ie. nothing in the block has been replaced except the bolt on water pump, no seals, no bearings, no oil pump). With Mobil 1 i was losing about 1/2 a quart a change, with Castrol, minimal loss. We'll see in a month how much or little I burn or blow by with the Amsoil (i'm guessing not much).