[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index] Bob's Synthetic Q
> I just changed the oil in my car (90 20V) and replaced it with the Mobil > 1 synthetic oil. 5w30 (winter coming and all...) > when I started the engine, cold, it read the usual 5+ bar. After it > heated up a while, it read +-3bar at idle. Now I thought the whole damn > point of synthetics is they dont lose their viscosity over the > temperature range. Its no better than the old dino I used to use. am I > missing something here??? Did I forget to carry the 2?? :) > > BOb Hey, Bob - that's really not an issue at idle. Synthetics resist viscosity change under use at high temperatures - idle pressure really isn't that relevant. I was told some years ago that a good rule of thumb for minimum oil pressure is 10 psi/1000 rpm. I use 14.5 psi=1 bar as my standard "damn-it-broke-again-and-I-gotta- convert-to-bar-to-figger-it-out" factor. By that conversion, you have 43.5 psi of oil pressure at IDLE!!!!!! Whoa!!! That's as much as most detroit iron runs at full rpm!! Since your idle is under 1K rpm, you're in good shape. The benefit will come in reduced engine wear, better resistance to viscosity shift under use, better ability to dissipate heat, and (in turbos) resistance to caking on the bearings. I believe you're ok. :-) *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** Al Powell Voice: 409/845-2807 Ag Communications Fax: 409/862-1202 107 Reed McDonald Bldg. Email: a-powell1@tamu.edu College Station, TX 77843-2112 W3 page - http://agcomwww.tamu.edu/agcom/rpe/alpage.htm *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
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