mtl911sc

The OEM stuff isn't 50/50 (unless it changed).

Considering many of us wish to keep our M96s running as trouble-free as possible for as long as possible, I'll repeat what others have said about spending a little more as being "cheap insurance", just like more frequent oil changes. Besides, it's not like you have to flush & fill your coolant annually.

I would imagine any other brand that's 100% compatible with aluminum engines may be ok. I figure why take the chance that it's not, when I don't have to buy coolant on a regular basis?

mtl911sc

You can use VW stuff too - it's (pink) G12 also.

Shark Attack

I didnt realize it was an aluminum thing. The 928 engine is all aluminum why isnt this on the 928 boards?

mtl911sc

Good question Kyle...I don't remember exactly what is "different" about G12 coolant, but i thought it had something to do with aluminum engine components.

Cefalu

Probably more than you ever wanted to know about coolants:

http://www.bobistheoilguy.com/forums...&Number=613263

BTW, Streather's 996 book says "The G12 coolant used by PAG is is Elf Glaceelf supra Antifreeze" then he goes on to warn that texaco DEX-COOL may be suitable equivalent, but use at your own risk.

I don't like being gamed by Porsche's marketing people, who would like you to believe their coolant is proprietary, when they have an OEM supplier package it up and slap a Porsche label on it, and then charge you a 50% premium. But The cost differential is probably about $30 for the whole coolant R&R procedure.

OpenEars

I want to see the results from the install. Hurry up!

chsu74

Ferd and I did the fan mod and I have been monitoring the coolant temp. The coolant temp runs around 91 to 96 degrees C from the middle of "180" to the left half of the "0". That work out to be 195.8 to 204.8 degrees F. I switched on the fan at 204.8 degrees F and it took approximately 3-4 minutes to drop down to 195 F. This was during idle in 65 degrees weather yesterday.

htny

ok i'm going to do this next weekend and will report temps from obd port (fan mod, not sure why anyone needs the lower t stat)

ivangene

+1
I dont get that either... I have tried to understand but keep going back to:

if the fans turn on at the same temp regardless of the t-stat, and your fans are on...the engine is at the same temp.....

chsu74

Unless someone can program the fans to come on at a lower temperature, the t stat is useless. Fan mod is great.

ivangene

+1000000!!

so why cant that be done?
is it programming or some sort of a thermal mechanical switch? either way, why couldnt it be done

(I am not electrically savvy)

Torontoworker

I have a pyrometer - where should I aim it to get the best indication of true tempatures after the car has warmed up? Would the over flow bottle be a good enough spot?

ivangene

no

how about the waterpump outlet/inlet ? or other metal "hose" that is not a heatsink to the motor????

Shark Attack

I can report back on this now with 5000 miles under my belt and 2500 of them with the mod.

The car runs cooler while at speed. However in traffic, its the same.

chsu74

Ran the car out to dinner with the wife tonight. stop and go traffic during rush hour for 30 minutes. turned the fan on manually when coolant temp hit 90 C outside temp was around 71 F. Shifting between second gear and third gear all the way, the coolant temp never went above 93 C.

On the way home, no traffic and car ran at 88 C highway speeds. Got to the parking garage with about 5 minutes local driving and parked with car idling. Coolant temp went up to 103 C from 93C in about a minute even with the fan on before it started to cool back down. I shut the car off with the temp at 92 C. It took about 4-5 minutes.

It is amazing how quickly our cars' coolant temp warms up when not moving. The fan keeps it in check.