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Discussion Starter #1 (Edited)
just about to do an oilchange from 10w50 fuchs to 15w50 motul and was thinking if i should bother draining the cooler (thermostatic grex relocation kit) and lines ?
normally i wouldnt, but now that i am changing brands it got me worried
 

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I went to 15w50 mogul in my 33,and had no problems.... But as for the coolant I'd drain in.
 

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I didn't when i swapped oil weights and didnt have any issues. i drained mine while i had the car apart thought.
 
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