p.mole1 Posted March 29, 2018 Share Posted March 29, 2018 How long should I leave it in? I have just rebuilt a 1.8 K with new rings, liners, bearing shells and a new oil pump. I am bit paranoid about glazing the bores. I have done 300 miles of spirited driving. Link to comment Share on other sites More sharing options...
Paul Mason Posted March 29, 2018 Share Posted March 29, 2018 Hi Phil, hope you're well, there are much much more knowledgeable than me on here so bear that in mind, but my understanding is the most likely cause of glazing would be constant and prolonged engine speeds (motorway driving and such like) and geussing that's not what you've been doing? Link to comment Share on other sites More sharing options...
p.mole1 Posted March 29, 2018 Author Share Posted March 29, 2018 Thanks, I don't want to leave this oil in longer than necessary. Link to comment Share on other sites More sharing options...
Manstein Posted March 29, 2018 Share Posted March 29, 2018 I did about 400 miles with a rebuilt Duratec before changing. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted March 29, 2018 Member Share Posted March 29, 2018 Procedure for my 1800 K after the rebuild.Jonathan Link to comment Share on other sites More sharing options...
Paul McKenzie Posted March 30, 2018 Share Posted March 30, 2018 It's good to use a magnetic sump plug after a rebuild then you can see the amount of powdered metal sludge that collects on the plug, which gives a visual indication of when the running in periods are over.I do 200 miles on cheapo 20/50, change oil for more 20/50 and repeat for 400 miles, then onto full synthetic. Link to comment Share on other sites More sharing options...
p.mole1 Posted March 30, 2018 Author Share Posted March 30, 2018 Thanks will give it another 100 mile Link to comment Share on other sites More sharing options...
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