After I get my first free change of 0W-20 oil for my GR86 from the dealer I will drain 2 quarts and add the Lucas. A biker friend who owns7 Bikes recomended. He ls a serious guy. He is going to the salt flats next month and expects to get 220 or 250 mph. I forget which.
Keep searching you'll help your biker friend understand oil and fill in his serious lack of knowledge...
What can you expect employing 50 grade instead off the specified 20 grade?
Josh buys a new car that requires 0W-20 motor oil. He hangs around
enough gearheads to have heard the old axiom that “higher viscosity
oil equals better wear protection.”
Wanting the best protection possible for his new ride, he drains the
0W-20 that came from the factory and installs 15W-50 racing oil.
Engines are built to use a certain viscosity of motor oil
Today’s advanced engines are built with much tighter tolerances than
their predecessors. The clearances between the crankshaft journals and
main bearings are tighter, for one. This is purposely done to allow
modern engines to use lower-viscosity motor oil, like 0W-20...
Why?
Lower-viscosity oils reduce internal friction since they flow more
easily than higher-viscosity oils, improving power.
Oil that’s too thick may not flow quickly enough
In Josh’s case, his 15W-50 racing oil may be too thick to flow quickly
enough to fill the spaces between the crank journals and main bearings
while the engine is running.
The oil won’t form a consistent lubricating film, allowing
metal-to-metal contact and wear. His engine was designed specifically
to use a lower-viscosity oil, in this case 0W-20. Its lower viscosity
allows it to flow faster and fill the tiny clearances between parts,
leading to a durable, consistent lubricating film
Not only that, but the engine will waste energy pumping the thicker
motor oil, reducing power out put. Since thicker oils don’t transfer
heat as well as thinner oils, operating temperatures will increase,
too, possibly leading to accelerated chemical break down and harmful
sludge and deposits.
If you use a viscosity that’s one grade higher or lower than what’s
recommended for your engine, it’s unlikely you’ll do any lasting harm.
But, to alleviate any concerns about engine protection and your
vehicle warranty, it’s best to use the viscosity recommended in your
owner’s manual.
Quote VP
Thick Motor Oil
Is a thick motor oil better if you live in a warm climate? You might
think a thicker oil (high viscosity) would offer better protection.
Well, yes, and no. Viscosity is critical to keep metal parts separated
within the engine and the proper viscosity grade does that. That being
said, you don’t want an oil that’s too thick because it creates too
much frictional drag within the oil itself. This creates additional
heat, which causes the oil to thicken (oxidation) and can also rob
engine performance by reducing horsepower.
