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[QUOTE]Originally posted by gadawg
[B]Let me set the record straight: my car is nowhere close to giving up...it is not dying nor is it mal-maintained. i am doing the same things i have always done in the past: oil changes every 3000-4000 with the dino oil, I just switched to synthetic.
That is the problem... You drove engine on dino oil, so the pistons and piston ring, valves, valve seals, bearings... etc... were lubricated by Dino oil which is very different than the synthetic oil... Synthetic oil is thiner than dino oil (even at the same viscosity)... Oil forms a thin layer on cylinder walls, on piston heads, rings, valves, oil passages through the engine... so when you switched to synthetic (whic is thiner, and maybe different viscosity than the dino oil), synthetic oil simply "washed" away all the dirt and oil layers formed by dino oil, because synth is more pure, better quality than dino oil... and that caused a blow by beside valve seals, piston rings, washed away dirt and stuff from dino oil from the oil passages... and simply synth oil passed through where dino oil couldn't - and burned. Tha first thing to do when changing from dino to synth is to use the thinest oil in viscosity to "wash" the engine (sometimes this oil is called engine cleaner oil or engine wash oil) inside...
Put that oil in the engine, run engine on normal operating temperature 15-30 minutes (depends which oil you use for cleaning)... sometimes you can drive few hundred miles... than you change oil again and put synth in the engine. You will be amazed on amount of dirt which will fall out of the engine!
Lots of people have that problem when they change from dino to synth... you cannot change from dino to synth without "washing" the engine from inside - sythh oil will do just that - because it is very different than dino.
I think that you have to change oil and filter again and it will be OK (but, you've done it hard way)...
Every engine will produce symptoms like that if you simply take out dino oil, put in the synth oil!
4) I never saw any smoke coming from the exhaust...I even rode behind the corolla a few times in the past few weeks (prior to the last oil change)...no smoke seen.
If the oil blowed by valve seals you will see the blue smoke only at start-up, and sometimes (not always) during hard driving or going uphill... and if the oil goes by valve seals it will go out very rapidly in large quantities...
7) 10w-30...this may actually hold some water as to my theory of the missing oil, since 5w-30 is so thin and since it's synthetic, it's extra thin. hmmm, i am going to try 10w-30 next time.
That is what I am telling you... that oil is much thiner and it is synthetic - it simply washed away all the dirt and oil layers formed from dino oil - and burned. You should have used engine wash oil bewteen switching from dino to synthetic oil.
You didn't do any harm to your engine, don't worry! Just be carefull next time and DON'T ever come back from synth to dino oil!!!
Best regards,
Ivan
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Cozmo
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