Had RedLine 10w40,MTL,75w90 in car. (I've never had dino since owning car) Switched to 15w40 Delvac1300,Supertech80w90, Pennzoil 80w90 with 2oz/qt Auto-rx in all components.
Mileage actually went down about 2mpg driving hard like I did with Red Line. I have been driving easy in attempts to get back some mileage and it is still 1mpg down. Not to mention Auto-rx should be reducing friction if anything, so this really blows...
Another thing is that my idle OP is down over 5psi. But this could be a multitude of things:delvac 1300 sheared down already, auto-rx thins oil, auto-rx already cleaned so much and starting to plug filter, supertech flow rate is poor, dino oil inherently has lower pressure than syn (althought I have heard opposite).
This delvac1300 has over 5psi less at 160F than what Red Line had at 210F. Red Line didn't seem to be affected much by heat.
Interestingly the Delvac 1300 seems to be running cooler, OT wise. If I do go back to Red Line I think it will be the 10w30 instead.
Edit: about the oil pressure, it is getting dangerously low even at only 180F is almost to 10psi. The warning light would be coming on at 7psi, if I hadn't replaced the sending unit for the VDO guage. Red Line never got below 15psi even over 210F....
So unfortunaly unless someone can GUARANTEE to me the Schaeffer's will hold a higher pressure and have better VI characteristics (not losing pressure at temp) than this Delvac 1300... I think it's back to Red Line afterwords. Just hope the RX fixes the seals permanently and does require dino forever to maintain them
Or I could use 20w50 dino and really have my mileage go to the pot...bad enough already...
[ November 27, 2002, 12:24 PM: Message edited by: Jason Troxell ]