Quote:
Originally Posted by S-Class Guru
A couple coments:
2. Personally I would never want my engine to run below 80C, which is 176 F. That's not the factory intent, and borders on possible sludge formation, and possibility of piston scuff, not to mention longer warmup periods - not good.
3. Why would a cooler thermo be better in 120 degree heat? The only time it would matter would be during initial warm up, where it would heat up to operating temp just a bit slower. But once it warmed up in that kinda heat, any thermo would be wide open and the radiator capacity would control the operating temp.
Now, if it were pretty cool, the system mifght be able to keep the temp down to the opening point of a cooler thermo, but the 87 thermo runs around 83 in these circumstances, so what added good would 79 or less do - see #2 above.
DG
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2: If you live in cold climates, yes....but as I said above, nobody should be using the 79C if you live in cold climates, there is no reason.
3: Warm up is extremely fast in summers at 120F, less than a few mins and coolant is at 80C. The 79C version just helps keep it cooler for longer. After a long drive, its a moot point...but heatsoak is really hard to control in this heat, so anything that prevents this happening sooner is worth it.
Being in Texas you should know Summer's are pretty brutal! Unfortunately the W124 chassis does not have a gigantic radiator to dissipate enough heat at 120F and keep it near t-stat opening temp...just the way it is. Plus, I am extremely meticulous and if I see it hit the 100C mark, I begin to watch extremely carefully even though I know its fine.