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Old 02-26-2010, 09:50 AM   #11 (permalink)
hzl6cm
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Quote:
Originally Posted by lavarock View Post
With low temperature any water that collects in the engine will not be boiled out. This will result in sludge and other bad things. Efficiency will also suffer.
While I agree that what you are saying is correct, just because the coolant is 160 doesn't mean that your oil temperature is too low to boil off any moisture. While I don't have an oil temperature gauge in my truck, so I can't say for sure, I do have one built in to my '04 Corvette and oil temperatures generally run 50 to 100 degrees higher than water temperatures. If coolant temperatures are reaching 160 and you are driving for 30 minutes I'm sure that your oil temperatures high enough to vaporize moisture (unless of course you have a head gasket leak of something that is flooding the oil with coolant).
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Old 02-26-2010, 10:13 AM   #12 (permalink)
crankme69
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Does yr Corvette have an oil cooler?
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Old 02-26-2010, 11:08 AM   #13 (permalink)
lavarock
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Quote:
Originally Posted by hzl6cm View Post
While I agree that what you are saying is correct, just because the coolant is 160 doesn't mean that your oil temperature is too low to boil off any moisture. While I don't have an oil temperature gauge in my truck, so I can't say for sure, I do have one built in to my '04 Corvette and oil temperatures generally run 50 to 100 degrees higher than water temperatures. If coolant temperatures are reaching 160 and you are driving for 30 minutes I'm sure that your oil temperatures high enough to vaporize moisture (unless of course you have a head gasket leak of something that is flooding the oil with coolant).
I agree with what you said. The operative is 30 min run time. Many of us do not run 30 min.
I can remember my father took a car in trade that had been used for a short commute. The car may have seen 20 minutes of running. That included the warm up time. It run so bad we opened the engine to try to fix the problem. The lifter gally was full of about 2 inches of sludge. A 160 thermostat will lengthen the time for the oil to come up to temperature. I do have an oil temp gage on my boat and it lags coolant temperature by 10-15 minutes. If I run the boat hard the oil may reach 250 after 30 minutes of running.
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Old 02-26-2010, 01:06 PM   #14 (permalink)
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Quote:
Originally Posted by Torque454 View Post
Mine doesnt heat up all the way in the winter. I have a meat thermometer in the heater vents and usually only see 120 degrees or so. The temp gauge doesn't even get to 160 most of the time, but in the summer it runs normal 190. I agree, probably the tstats. But who knows... I cant get my other vehicles to get up to normal temp in the winter either. And ive tried new thermostat after new thermostat after new thermostat...with no luck. Grr! You could put cardboard in front of the radiator but make d@%& sure you remove it come spring or you'll be overheating and replacing head gaskets or worse.
Mine heats all the way up no problem in MN winters. I drove it in -15F and it got up to 195F before the stat opened and cruised at about 180F. It took a few more minutes to heat up but it did no problem.
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Old 02-26-2010, 01:13 PM   #15 (permalink)
hzl6cm
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Quote:
Originally Posted by crankme69 View Post
Does yr Corvette have an oil cooler?
I am not sure - it has what the factory put there. I normally monitor oil temperature in the mornings so I don't stress the engine with hard acceleration until it gets up to 150 or so and I know that the oil heats up much faster than the coolant (the oil temp displays on the computer display so I can monitor the coolant temp guage at the same time).
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Old 02-26-2010, 02:44 PM   #16 (permalink)
crankme69
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I just replaced my t stat on my 95 6.5 with a AC Delco 190 I got from Rock Auto. Works great, holds the needle right at 190.

Prior mine was running around the 170's on the road and would drop down to 160 if left setting at idle.
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1995 1500 Silverado 6.5TD 2WD Ext Cab 230K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake

1995 Tahoe 6.5TD 202K Buddy chipped cat & muff delete

1994 1500 Silverado 6.5TD 2WD RCLB 165K Buddy chip EGR disabled else bone stock work in progress...

1996 TDI Passat 190K 49mpg avg

2005 FLHTC 107 Twin Cam Fueling 574 cams, 10.1 CR, Mik 45, DTT map, 3.37 final, E1 clutch & VPC with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 120Tq & 120Hp

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Old 02-27-2010, 10:01 AM   #17 (permalink)
marioriba
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I am from Costa Rica, Central America, I own a 2000 GMC 3500 with a 6.5 L engine, 4L80 trans and 4x4 single rear tire.
The problems I have had is that when I reach the mountains here my temp starts raising above 210, which I have read is dangerous for my transmission, I just build the trans 5 months ago and clean all the radiators from debris, which made a great improvement, also I took out the catalytic converter which brought the temps down.
However when going uphill with the AC on or heavy on the engine the temp will rise over 210 up to 240!!!!, well we changed the thermostast, we change the radiator cap and still had problems, then we drill a small hole in each of the thermotasts and usually the car runs on the 185 degrees range in highway, but still heats up uphill, well finally I change the Fanclutch and know it works much better, I dont have the temp rise over 195 or 200 F
Now my question is, normally the temperature in Costa Rica is between 75 to 104 F, would it affect my engine performance and or fuel economy if I drive my truck in the 170 F range temp all the time?
Now I can go uphill with my AC on with no problem, if really sunny day the truck water temp will normally be at 180F

I use Valvoline 15W40 Allfleet Plus oil engine only in my truck.

Thanks
Mario
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