Don't need no 4th gear!
Join Date: Apr 2007
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Owner's Manual Oil Weight chart
Okay, I've asked this before somewhere, but I'm paranoid when it comes to my Accord and it's been awhile since I asked (so I'm not completely clear on what the answer was anyway.)
Here's the thing - the owners manual for my 1982 Accord (with the EK1 motor) says that if the ambient temperature/weather is really hot (over 90F) I should use 10W-40.
That just seems insane to me - I always heard that 10W-40 was for big V8's, and smaller engines use lighter oil.
Here's what the diagram in the manual says:
5W-20 : Under 15F
5W-30 : Under 32F
10W-30 : -5F to 90F
10W-40 : -5F and higher
20W-40 : 15F and higher
I just can't imagine that little 1.8L doing anything but gagging on the the weight of 10W-40, regardless of the ambient temperature.
I got Quaker State 10W-30 for it this oil change, since it'll be seeing the early summer before the next change (maybe mid-summer) and I ran 5W-30 in it this winter. I use a very light foot with this car, partly because I don't intend to destroy it, and partly because it doesn't really matter (a stock EK1 isn't going to impress anyone with an AT regardless of how you flog it.) She sees city and highway miles, just enough of each and in every combination to guarantee that her chores aren't any lighter than possible. (There's plenty of stop-and-go, before and after highway driving, and the highway driving is both short and long duration... pretty much every conceivable condition except dusty country roads.)
And in fact, I now notice that on the back of the manual it says to use SAE 10W-30 unless the temperature is under 0F.
I plan to own this car long enough to put antique tags on it, and I want it running flawlessly for every single one of those years. Is the manual just out of date in terms of modern oils?
Currently I'm thinking that 10W-30 is probably what I should be running in the summer (it gets north of 100F here some days), and maybe 5W-30 in the winter since she seemed to like that. No synthetics, since she's got too many miles on her to switch to that without turning the gaskets into colanders.
So what's the truth? Is 10W-30 too light for hot weather? Is 5W-30 too light for cold weather?