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Message: [QUOTE="Wayne, post: 1088044, member: 863"] Here's a pretty good explanation of viscosity as there was misleading info earlier. [URL="http://www.upmpg.com/tech_articles/motoroil_viscosity/"]http://www.upmpg.com/tech_articles/motoroil_viscosity/[/URL] We also need to keep in mind oil gets thinner as it gets hotter. The thinner it is, the easier it flows out of bearing surfaces, and the less ability it has to protect and maintain adequate pressure. This is especially important where the engine is being taken beyond it's original design limits. Last round the truck didn't get the bugs all worked out before it was stressed to the point of failure. A known problem at the time was excessive oil temps, so he is having changes made to keep it in check. There is no finger pointing going on here, just soving a known problem. If everybody had more time to dial in the truck before dpc, all that stuff would have been addressed previously, but they ran out of time. Considering the oil is cooled by engine coolant, we can easily see the target oil temp is also the target coolant temp, controlled by the primary cooling system thermostats. When the engine goes back in the truck, the plan is to add an oil to air heat exchanger with a mechanical bypass until it meets a minimum temperature. It will also have a thermostatically controlled fan to make sure it stays in a target range. I really don't get why you guys are mocking him for upgrading an insufficient oil cooler. It's not like he's shooting for a temp range out of the ordinary here. Back when I did a lot of heavy towing with my built motor 6.4, my primary concern was excessive oil temp, followed closely by coolant. This was with a new, clean factory oil cooler. Pyro was a distant 3rd for temp concerns, and I towed in the race tune. Granted, I'm not complaining because I was flying past people who were maxed out, and I had way more weight. It was nearly perfect for what I wanted. That's what this is all about; a guy setting up his truck the way he wants, for how he intends to use it. Personally I think the oil cooler deal is a great upgrade. I look forward to seeing everything come together the way Dan wants it under less rushed circumstances. [/QUOTE]