Oil hotter with aluminium rad - Engines Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Oil hotter with aluminium rad

mekapaedia

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Location: Vigo

Registered: 19 Jul 2016

Posts: 19

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Post #1

Hi guys, long time listener first time caller. I've had some issues with my GTI-6's cooling system and the local dealership here replaced my old and poorly working stock rad with an aluminium one from a local company here in Vigo. Usefully, water temps do seem to be lower but when pushing on the oil temp gets much much higher, into the 120s whereas before they stubbornly stayed around 90. Any ideas?

The rad itself seems to be on the crap side, I had a plastic hose connector break within the first 4 days and the replacement seems to leak (at least, it hisses) where the top of the plastic overflow tank meets the body...

Posted 13th Jun 2017 at 09:25

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

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Post #2

if its leaking take it back.

how hard are you driving to get 120?!

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Posted 13th Jun 2017 at 11:03

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mekapaedia

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Location: Vigo

Registered: 19 Jul 2016

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Post #3

Not that hard - as I said before it was around 90 (maybe 100 at times?). Driving habits haven't changed.

Posted 13th Jun 2017 at 11:12

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miki4

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Location: Cologne

Registered: 09 Nov 2015

Posts: 389

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Post #4

Check if the oil/water heat exchanger is connected to the cooling system. Could be they used a rad for another 306 without the respective port.

I'm only getting to 120 after some minutes of full chat on the Autobahn. Big grin

Posted 13th Jun 2017 at 14:05

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mekapaedia

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Location: Vigo

Registered: 19 Jul 2016

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Post #5

Which one is that? Passenger side at the bottom?

EDIT: to be specific, LHD passenger side

Posted 13th Jun 2017 at 14:41

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miki4

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Location: Cologne

Registered: 09 Nov 2015

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Post #6

Yes, it sits right behind the oil filter. You can see it in this pic:

Posted 13th Jun 2017 at 14:50

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mekapaedia

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Location: Vigo

Registered: 19 Jul 2016

Posts: 19

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Post #7

Checked... it's all connected up. Thinking of just biting the bullet and installing a mocal cooler, aiming to visit the Nürburgring in August and that's about the last place you'd want an issue.

Posted 13th Jun 2017 at 15:56

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #8

you shouldn't need an oil cooler on a standard car for just a ring lap, its the GP track which is hard on cars.

I would get a nissens or Ordonez rad ordered.

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Posted 13th Jun 2017 at 16:47

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mekapaedia

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Location: Vigo

Registered: 19 Jul 2016

Posts: 19

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Post #9

Is the Valeo any good? I am sourcing the rad fans from a guy near here (because they don't work either...) and he is parting out his 6, says his Valeo is decent and available.'

EDIT: If the water temps are fine but the oil is not, how would better radiator make a difference?

Posted 13th Jun 2017 at 16:55

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deeturbo

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Location: Leighton Buzzard

Registered: 22 Feb 2003

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Post #10

I'm thinking the outlet to the oil heat exchanger might be blocked.

I've seen some rads with the outlet but sealed on the inside, if that make sense?

Posted 13th Jun 2017 at 19:04

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mekapaedia

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Location: Vigo

Registered: 19 Jul 2016

Posts: 19

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Post #11

Well on the last rad when that specific fitting broke it definitely emptied all the coolant out, should I check if the hose to the exchanger seems to have liquid in it?

Btw... when the engine revs I can hear something like air being compressed or pushed out somewhere, is it just the overflow tube on the rad? A little coolant comes out sometimes but I assume that's by design.

Posted 13th Jun 2017 at 19:22

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Cjwatson27

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Location: Oxford

Registered: 17 Sep 2013

Posts: 1,968

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Post #12

Can you get warm air out of the heater ?

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Posted 13th Jun 2017 at 20:33

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mekapaedia

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Location: Vigo

Registered: 19 Jul 2016

Posts: 19

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Post #13

Yep, no issues there.

Posted 13th Jun 2017 at 21:41

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prism7guy

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Location: DoncastAAAAARGH

Registered: 13 Jan 2008

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Post #14

mekapaedia wrote:

Checked... it's all connected up. Thinking of just biting the bullet and installing a mocal cooler, aiming to visit the Nürburgring in August and that's about the last place you'd want an issue.

Not a bad shout, the oil temps do get pretty high on track if you don't have a proper cooler on them from personal experience, but I guess a lot of that depends on how much abuse you give the car.

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Posted 14th Jun 2017 at 00:46

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mekapaedia

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Location: Vigo

Registered: 19 Jul 2016

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Post #15

Went to the official dealer today to get them to take a look... to me, the hose from the rad to the heat exchanger seem to lack pressure but they said it was all normal. They told me that with 90 degree water temp 120 oil is pretty normal... and that it's largely down to my crapped out radiator fans. Bit suspicious of that but we'll see.

Posted 14th Jun 2017 at 13:22

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jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

Posts: 3,702

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Post #16

mekapaedia wrote:

They're talking shizen, 120 oil temp is getting close to the oils breaking down point. I'd look more closely at the oil/water heat exchanger, also random one but the oil temperature transmitter is worth checking, just to rule it out?

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Posted 14th Jun 2017 at 14:03

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mocinim

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Location: The Darkside of bedford :)

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Post #17

Does it smell feel really hot or are you just going on the gauge??

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Posted 14th Jun 2017 at 14:30

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fatlapit

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Location: STOCKSFIELD

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Post #18

120 degrees the oil will be useless unless its decent oil.

I fing the gauges on the 6 fairly accurate tbh

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Posted 14th Jun 2017 at 14:58

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mekapaedia

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Location: Vigo

Registered: 19 Jul 2016

Posts: 19

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Post #19

Just based on the gauge. Engine gets hot a lot because it's hot here and the fans don't work so well... but I don't smell oil fumes or in fact any bad smell.

Oil temp gauge seems really logical in its movements, doesn't move suddenly and warms up with the engine... how would I diagnose a bad sensor if the gauge seems okay?

I'm thinking of swapping this rad for a nissens... just don't really want to spend the 110 euro.

Posted 14th Jun 2017 at 15:00

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #20

its worth it an also sounds like yours is faulty so should go back anyway.

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need a part number? get on here - http://public.servicebox.peugeot.com

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Posted 14th Jun 2017 at 15:08

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miki4

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Location: Cologne

Registered: 09 Nov 2015

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Post #21

It's likely that the new rad is s**te because the oil temperature was normal before the repair. Probably there is not enough flow through the oil heat exchanger. Or it got blocked during the repair.

However, a Nissens rad is worth the money.

Posted 14th Jun 2017 at 16:40

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3rd time lucky

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Location: maidstone

Registered: 23 Apr 2007

Posts: 1,878

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Post #22

I've heard different coolants mixed can block some waterways in the engine. I would get that Valeo rad and coolant flush it. Failing that, nissens rad ftw. And oil cooler if you plan to hoon it quite a bit as they do get rather hot quickly. Although as said, shouldn't be necessary on a standard engine unless doing trackdays.

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Posted 14th Jun 2017 at 20:55

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adam b

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Location: The Nam

Registered: 24 Jan 2006

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Post #23

1. Nissens rad
2. Good proper coolant, flush it first and bleed it correctly
3. Oil cooler with a thermostat take off, invest it's worth it
4. Good fully synthetic oil

120 oil temp is feck all. I get worried above 140... But then the oil I use works to over 150

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Posted 14th Jun 2017 at 22:21

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mekapaedia

Newbie

Location: Vigo

Registered: 19 Jul 2016

Posts: 19

Status: Offline

Post #24

What would be considered "proper" coolant?

And what would be a good oil choice? I was thinking of getting "Fuchs Titan Race Pro S 10W-50" put in.

Posted 15th Jun 2017 at 10:15

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ale624

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Location: bristol

Registered: 02 May 2016

Posts: 173

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Post #25

Hahaha, f**king stealerships man. 120 is normal, got to be having a laugh!
if everything was fine before the rad swap, then it has to be the new rad.

coolant is the pink kind.

for Oil i use Full synthetic 5w40, although 10w50 should be perfectly fine.

never seen my oil gauge even think about going over 95, even while giving it some beans.
Coolant can creep up a bit, especially while sitting in traffic, but never seen my oil gauge go over 90 while just around town.

Normally it hits 90 and stays there.

Posted 15th Jun 2017 at 13:50

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