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Old 05-19-2002, 07:25 PM
JHZR2's Avatar
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Join Date: Jan 2002
Location: New Jersey
Posts: 4,239
Synth. oil and Heat exchange


my 1983 MB 300D runs quite well, but can get hot 100C or a little above) when running on hot days with AC. Usual operating temp is more like 83-85. Ive heard that synth oil has better cooling behavior in autos, so the engines and cooling system requirements can be lowered. Is this true? Since I have an oil cooler on my car, if I used synth, would I notice much of a diffeence?


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Old 05-19-2002, 08:59 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 12,783
Stay away from synthetics on this car (Please don't let this start a dino versus syn debate - there are already enough of them). Go with a good quality diesel rated oil like Delo 400.
Check your coolant to water ratio. I have found 40% coolant, 60% water works pretty well along with a little water wetter. Make sure all the cooling components are working good. When was the last time the cooling system was flushed? I would be surprised if your oil cooler thermostat ever opens sending oil through that cooler.

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