: Conventinal oils using Viscosity Improvers cause problems in hot running
: engines. A friend had a 4 cyl. where the rings had seized so bad they
: ended up throwing the pistons away. It was blamed on using 10W40 which
: has over twice as much VI as the recommended 10W30.
My sister was running 10-40w in her 4 cyl. Camry, it blew out the oil pump
housing gasket right next to the oil pump's pressure relief valve the first
winter she had the car (bought used). I blame that on too heavy an oil as it
should have been using 5-30w. No probs since I repl. the gasket 80k miles
ago with the right oil onboard.
The Harley air cooled motor is the hardest on oil that I know of, it has no
oil cooler and the rear cyl. is blocked by the front one. The recommended
minimum non synth. oil by them is 15-40 diesel oil for summer use. I feel
the low bottom numbers are just not up to high temp. use, the Harley runs a
220-230 normal oil temp in summer weather and at high temps my belief is
that it cooks out the additive package designed for low temp use.
That's why nobody will recommend or even makes a 0-40, 5-40, etc. oil. The
tech. isn't there yet, but I'll bet it's on the way.
"anything you say can & will be misquoted & used against you"
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