I tried that a while back and 10W-30 made absolutely NO difference in my
oil consumption. My car's been fed 5W-30 since day one. It now has 260,000
miles on it and gets over 2,000 miles per US quart.
How's your oil consumption?
Unfortunately, I did not monitor my oil consumption.
As of this message, I will begin doing so.
I simply get my oil changes around every 4,000 miles or so. If I was able
to get 2,000 miles per US quart, and 3.8 quarts of new oil are installed
per go around, could I, in theory, reach 7,500 miles between oil changes?
Oil is not consumed as fuel is. If it was, they wouldn't have to drain it.
How dirty is your oil at 4000 miles is the question? At 148,000, my '01
Accord doing 7K oil changes (I have a long highway commute) the oil is
dirty, but not black.
If you are consuming oil, that means you are burning oil. Others can give a
better description of the mechanics behind how oil gets into the fuel being
burned, but in essence, in those cases a thicker oil might not sneak by the
way thinner oil does. If you're not burning any oil (as in 3.8 quarts are
coming out at each change) then there is no need for thicker oil as you do
not have a problem with the thin stuff.
Our local Honda dealer only offers 5-20 for all Hondas new and old with the
claim that Honda has authorized this. My Prelude calls for 5-30 or possibly
10-30 in hot weather which we have in abundance here in mid GA in Summer.
Am I right to be uneasy about using 5-20.
What year is your Prelude? How many miles?
Try it for one go-around and see what happens. I'll bet you won't notice
any difference of any kind. The 5W-20 is part synthetic, so it has slightly
better film strength. Film strength is probably comparable to that of 5W-
What's the "risk" with the factory recommended 5w-20? My '01 Accord EX-v6
with 148,000 miles and 7k between changes is still running strong, running
smooth and starting up on the first try.
I bought a Honda for durability and economics. You seem to be wasting a bit
of the economical advantage of a Honda.
I use a 5-30 in winter, and a 10-40 in summer for my 88 civic, also in
mid-ga. burns a bit of oil, and a little water in the summer (refill
the expansion bottle once a week basically) but its been 3 years and
no problems on that score.
Not to dispute Tegger's claim, but just to offer evidence that your
mechanics are not totally whack-o: I have seen internet sites that suggest
switching to a higher viscosity oil for older cars. It's worth googling.
I've seen that also, but usually in reference to burning oil and how to stop
said oil from making it into the combustion chamber. If the thin stuff
isn't sneaking by the rings, then switching to thicker stuff won't have any
I'm not seeing your posts, for some reason, just other peoples' replies to
If an engine is consuming oil, it means the oil control rings are worn out.
If you were using 5W-30 and were experiencing excessive oil consumption,
you'd have to move up to something like a 20W-50 before it made any
meaningful difference. Simply going up from 5W to 10W will do absolutely
nothing, especially when the hot end of it is still the same (30).
My oil consumption used to be roughly 8K/qt when the car had 100K miles.
Now I'm down to just over 2K miles. That's with 5W-30 and 260K on the
My oil check procedure is this:
1) Change oil
2) With engine COLD and having sat overnight, check oil and note dipstick
3) Drive car 1,000 miles
Repeat from #2.
The car is ALWAYS checked with it parked in the identical same spot, at the
When I temporarily switched from 5W-30 to 10W-30, there was zero difference
in oil consumption. I moved back to 5W-30 to take advantage of 5W-30's
slightly better cold flow characteristics.
I think the general idea in this is that the thinner oil will seap
thru seals and gaskets that are aging. It's the same principle of
why you don't use synthetic oil on old cars. It's so slick that it
will leak in almost every seal. Another thing is the piston rings
that might not scrape the oil from the cylinder walls.
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