Happy Solstice to you all! May the season be peaceful and safe.
After putting synth oil (Valvoline Full-Synth 10-30) in the GT6 I
could swear the engine sounds different, feels different. Mind you,
I also replaced a totally wide-open thermostat. The engine seems
happier, quicker to warm, peppier. Perhaps it is my imagination.
The heater works better!
But I also notice different sounds. I hear a shweooeooeooeoo...
sound at idle as if something was rubbing. Maybe it is just the belt
that I never heard before. Maybe it is the water pump, or water
swishing through the thermostat. Maybe I hear the tach cable more
now that the engine is quieter. But it sounds like metal on metal
rubbing lightly. Or the valve train, except that it isn't quite a
tapping like valves adjusted loose. I ain't sayin' they aren't maybe
a bit loose, only that what I'm hearing doesn't sound like that. It
is almost as if I could hear the cam followers, but naw, that's not
possible, is it?
Is this typical? Does the seemingly lower viscosity make this
difference?
I also notice that the engine seems to run cleaner, less smelly. And
the oil has practically no smell at all.
Final question - the guy at AutoZone said that once I started with
synthetic oil I couldn't go back to fossil oil. Don't know that I'd
want to but I'm curious. Is this true? If so, why not? If I found
myself a quart down at an isolated gas station in the desert which
carried only a fossil oil, would it hurt to put in one quart?
Thanks in advance!
Jim Muller
jimmuller@rcn.com
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