1990 300sel.put new radiator in,new hoses.just changed oil,dipstix looks clean,no white smoke,no overheating,small gasket leak?
Usually a head gasket doesn't leak oil in the radiator. But they can. Most times it is the radiator. They have transmission cooler lines and some times engine cooler lines that run to the radiator. The cooler in the radiator ruptures and oil gets in this way. Since you replaced the radiator, it could just be residue from the oil being in the coolant system. Check the transmission fluid. If it is a pinkish color, change it wit the filter as soon as possible. Transmissions do not like water or coolant.
Sounds like a warped head take to a mechanic have a compression test done. DO NOT USE ANY GASKET SEALER
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