Replacing Radiator
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nplenzick: I have an 2008 auto-Z51 and i know the trans is cooled by the radiator but i have never seen a engine oil cooler? i was told that only the manuals had a engine oil cooler which is also cooled from the radiator did i read you post wrong that you have an external oil cooler?.....I'm old as dirt and maybe i took it wrong?...Thanks
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2025 C6 of the Year Finalist - Unmodified
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Any of the aftermarket aluminum radiators will be of better quality than the OEM unit
Safety Car
Joined: Aug 2017
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From: Etobicoke (Toronto) Ontario
nplenzick: I have an 2008 auto-Z51 and i know the trans is cooled by the radiator but i have never seen a engine oil cooler? i was told that only the manuals had a engine oil cooler which is also cooled from the radiator did i read you post wrong that you have an external oil cooler?.....I'm old as dirt and maybe i took it wrong?...Thanks
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Automatics did not come from the factory with engine oil coolers, either in the rad or external. I believe the Z51 manuals switched from using the rad cooler to an external cooler at some point. Not sure if they ever used both at the same time. You can install an external OEM Z51 oil cooler on your A6 using all the OEM parts that the M6 uses. This includes either switching to the M6 rad shroud that has the openings for the cooler lines, or cutting the same opening in your existing shroud. I did this last year, electing to go with a new shroud. Everything bolts right up as it was designed to do. It's more than sufficient for street use. If you track your car, the cooler from a Z06 or ZR1 might be more to the point, but I wouldn't use it on the street. It would take way too long for oil temps to come up.
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