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Craig, I'm trying to locate the site and will soon find it again, but there was a very extensive amount of research done on engine oil cooling and the overall effect it had on engine life and the life of the oil. It was from Lycoming and pertained to the 4 cylinder aircraft engine, but that isn't much different then a mil spec Porsche 917 engine. In a nutshell, 20% of the cooling came from the oil coolers. 67 Single Cab, DP 1641cc 34 PICT-3 71 Trike 1776cc Dual T-4 34 PDSIT-3 VolksAir 1585cc 31 PICT http://mywebpage.netscape.com/alphahr/case.html Ray, Kent WA Bernoulli Interval: Do I really have enough data to draw a valid conclusion ? ********************************************************* -----Original Message----- From: craig k Subject: Re: [VB] Engine Oil & Cooling i'd like to hear from those running extra oil coolers and see how often they change valves or replace pistons. i'm guessing they do it a bit more frequently than normal (flame suit on!) despite the cooler. the extra heat exchangers may help the oil cooling the cylinder walls and back of the piston shed just enough heat to keep many engines JUST this side of the high-wear heat zone, but i imagine there is a pretty quick crossover point........ Craig K 70 Neunsitzer 65 Pritschenwagen "Guard against the impostures of pretended patriotism." -- George Washington ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org