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Well, probably a few opinions in old posts. 82 C is Posted by John Fitzgerald [Email]  (#77)  [Profile/Gallery]
(more from John Fitzgerald) on Sat, 12 Apr 2008 11:08:54
In Reply to: in new eng use a 82 or 89 C thermostat?, danah, Sat, 12 Apr 2008 10:36:49 Members do not see ads below this line. - Help Keep This Site Online - Signup |
going to run cooler, so in theory the mileage might be slightly less. I haven't found much difference in practice.
I just did a massive heater core/blower motor plus all heater hoses, upper rad hose, and thermostat job on the 97 Aero. And this is just two months after putting in a water pump, with new lower rad hose. And in doing this, I swapped the 82 C t-stat I've had in for the past couple of years back to the stock 89 C.
I keep detailed fuel & maintenance logs [types of fuel, mileage, any cleaners, etc] and can't say there was any difference in mpg. I get a consistant 28 to 29 mpg in mixed rural/suburban driving, 30 - 31 mpg on the highway at 73 mph, and 33 - 35 mpg for long trips on back roads at 60 mph. I keep the tires at 36 psi front/38 psi rear, stock wheel and tire sizes.
The temp gauge certainly shows a difference: 82 C spends most of the time at about 7:45; the 89 C is usually 8:30. The 89 C seems to warm up noticeably quicker as well. I use a 50/50 mix of GM Dexcool Longlife coolant and distilled water, plus I add a bottle of Redline Water Wetter.
Some of the older posts might refer to the colder Mercedes stock t-stat, or keeping the temp down a bit for the sake of cam chain/balance chain guides [plastic] wear issues. I've had my wife overheat the engine but good a few years ago [NOT the Aero, is was a 87 9000T] with the classic "no power steering, battery light on, and oh, look at the temp gauge." No ill effects [she drove until temp gauge pegged at highway speeds], the chain guide must be fine -- I've never done the chain [guilty] and it has 180,000 mi. Of course, the pre-balance chain motor has a thicker chain, but still ...
So, I guess it's up to you. I live in Wisconsin, so most of the year, a quicker warm up outweighs other considerations.
And the Aero's t-stat is certainly a bit tougher to swap out than the older motors - heck, when I drove my '86 9000T and 1980 99, I'd put a 'winter stat' in each fall and trade it back out in the spring. Did that for the better part of a decade up here.
John
Burlington, Wisc
'73 96 RHD sold after four years in Middle Barton, Oxfordshire, UK
'80 99 sold after 20 years/192,000mi
'86 9kT sold after 12 years/approx 121,000 mi
'87 9kT sold after 9 years/approx 174,000
'97 CSE 225,000
'97 Aero 147,300
_______________________________________ John Burlington, Wisc '73 96 RHD sold after four years in Middle Barton, Oxfordshire, UK '80 99 bought new, sold after 20 years/192,000mi '86 9kT picked up at Trollhatten, sold after 12 years/approx 121,000 mi '87 9kT sold after 9 years/approx 174,000 mi '94 CSE given to my son after 8 years @ 245k; he sold it at 254k mi '95 Aero 146,xxx mi sold '98 CSE 248,xxx mi gave it away '97 Aero 317,xxx mi my daughter’s school car … gave away [we put 300k mi on it] still driving: '97 CSE 170xxx mi 'project car' for myself and my daughters to drive '07 9-3 2.0T 240xxx '08 9-5 191xxx mi my wife's daily driver and a couple of 'non-Saabs': '01 Suburban 201,xxx mi '03 BMW 330 Cic 84,xxx mi '14 Mercedes E350 103,xxx mi
, Sat, 12 Apr 2008 11:08:54 <-- Viewing This Message
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