A few days ago I put up a post enquirying about my noisey engine. It was only noisey first thing in the morning, when it warmed up it ran fine, which was a bit of a puzzler. I thought it could be the oil was to thin (Vaux semi 10/40) but it only made a noise on start up. And I knew the oil got thinner the hotter it became so in theory the engine should have got noiseier, which is why it became a puzzler,
I put some 'stop smoke' in to thicken it up (like cornflour to gravey) and these last 2 mornings its been fine. I don't know why its doing the opposite to what it should be doing.
As much as i would like it to run on semi, 10/40 maybe a bit to thin for a 12 year old 8 valver with 126000 miles on the clock. At the next oil change I may use Magnatec 15/40.
Any suggestions or thoughts would again be welcome
thin oil will drain out the tappets when the engine sits overnight - putting in smoke treatment has likely put the viscosity up a grade or two, so they're most likely staying charged longer - hence no rattly noise when you fire it up.
the noise you describe is not dependent on oil temp - it's related to the above, plus the ability of the engine to get some oil pressure up to the head quickly - which has probably also been affected by the 'gravy'
would this "stop smoke" stuff help with my suspected valve stem oil seals not being right and getting smoke out the back when engine has warmed up and i go to pull away, having been stuckin traffic for say 2-3 mins???
I first recommended this 'stop smoke' to a neighbour, because he found it embarrassing sitting in traffic with mases of smoke appearing in his rear view mirrow. When he used it, he came over and thanked me for it said it did the trick. Pity he's now been banned for DWC (driving while canned) and he no longer has the car. You can but try. It certainly wouldn't do any harm. (I don't think).
But I'm sure somebody out there will say something, if it is harmful