Tag Archives: bob is the oil guy

Engine Oil Coolers

Engine oil coolers are more important that you would think.  When most people think of an engine oil cooler they think of a big heavy duty truck (F350) towing and hauling.

Truth is modern cars don’t just push oil through their engines… they more or less chew it up and break it down.  Again I’ll leave the specifics about which oil brand/type is the best for discussion on the BITOG forums.  www.bobistheoilguy.com

So what does this have to do with oil coolers?  Well Ford upped the 5.0L coyote motor to 8 quarts to help keep the engine cool instead of a large engine oil cooler up front.  They also mention that an oil cooler is recommended if you plan on track use… who buys a Mustang and doesn’t put the pedal down to the floor… really???  Ford did use an air-to-water cooler (see below – not mine just found a quick pic on Google) but those are pretty much useless.  Yes they do a good job of warming the oil up to temp with the radiator fluid, but at the track your radiator fluid is typically screaming hot.  Not good for your oil.

OEM Mustang oil cooler

Enter an external engine oil cooler.  Warm-up may take a little longer, but you can always use an external bypass until the temps come up.  A bypass works by short-circuiting the fluid path… basically the fluid short cuts around the cooler and goes back into the engine until it gets warm enough.  Then a spring closes off the short cut and the fluid now is forced through the cooler.  If you plan on any sort of track day an engine oil cooler is a must; its cheap insurance to help your engine oil keep your engine alive.  Those of you that don’t drive on a track but have teenagers at home – your car has seen more ‘track days’ than you think.  Even if you drive slow but live in a southern climate where the summers are a beating – go with a cooler.  110°F outside temp only compounds this problem further.

Many people see an engine oil cooler and think they can short cut with a transmission cooler.  WRONG!  Transmission coolers are designed for lower flow rates and should NEVER be used for engine oil cooling unless the manufacturer says its OK.  Most transmissions run in the 1 to 2 GPM range and use 3/8″ lines and fittings.  Engine oil coolers should have 1/2″ lines and fittings and a cooler to match the flow as well.  An engine oil cooler should support up to 4 or 5 GPM – much less will begin to restrict the oil flow.

P. Heffcac

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Power Train Cooling

Winter is here… Now’s the time to plan the upgrades for the spring.

Fluids perform at their best when they are fresh, clean, and cool.  The synthetic swap is a debate I’ll leave for the bitog forum gurus. Of course the next step is to keep them cool. ATRA (auto trans rebuilders association) released research showing every 20°F drop in fluid temp doubles its life span.

So where to start?  Transmission cooler is my suggestion.  Transmission repairs are costly and can be a nightmare if the problem is misdiagnosed or something else is missed.

So if you start looking around there are a ton of choices out there for transmission coolers.  So who do you choose?  And why?  For starters I wanted a cooler from a manufacturer, not some parts importer. Manufacturers that have their name on the cooler have more skin in the game.  Next I look for the age of the company. Appears Hayden has been in the game the longest… and they have a bad ass plate fin cooler at O’Reilly Auto. Sold.

Scan tool shows 170°F trans temp after some spirited driving (within the speed limit on the frontage road of course).

Next up, engine oil cooler.

P Heffcac

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