savi18 Posted February 29, 2016 Share Posted February 29, 2016 Changed the valve stem seals and hydraulic lifters weekend just gone and now blue smoke after engine over run and when stuck at traffic lights and set off, no blue smoke when hard driving though, did loads of these years ago when mechanic in UK, 20 years ago and never had any problems, the only thing changed was changing engine oil to 5/30 fully syn oil but this was 6 months ago, only smoking since seals fitted, these came with head set when did head gasket last year, all seals where double checked when fitted so doubt if they came adrift, thinking now the oil my be to thin for 30 year old engine, used to add 15/40 or 10/40 when used to do oil changes, here in NZ there auto stores recommend 5/30 which I think is wrong and too thin, anyone had problems using 5/30 syn oil, Cheers Quote Link to comment Share on other sites More sharing options...
Guest username Posted February 29, 2016 Share Posted February 29, 2016 Probably is a bit on the watery side seeing as you'll be in the late stages of summer down there (lucky git lol). Another thought, was the head set you bought new or NOS? if it's old or been stored badly the seals could've gone hard maybe... Also are the breathers/pipework clear? Most likely the oil tho' to my mind. Quote Link to comment Share on other sites More sharing options...
Ian71 Posted February 29, 2016 Share Posted February 29, 2016 Did you change head gasket ? Quote Link to comment Share on other sites More sharing options...
savi18 Posted March 1, 2016 Author Share Posted March 1, 2016 Changed head gasket last year as received the car with engine running on 3 cylinders(No 1 cyl exhaust valve knacked) fitted new Head Gasket/Bolts everything running great afterwards, done around 30 head removals on these over years without any problems, I now think the problem is down to the oil too thin, adding 5/30 engine oil and the outside temperature here in NZ around 34 degrees and that's hot here, the oil must have like water, so next couple of days gonna change oil to 10w/40 and temps here are now down to 15c and see what happens, Cheers Quote Link to comment Share on other sites More sharing options...
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