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I would leave it, as others have suggested. But a second option, if you have any hard starts, or if it just bothers you, or whatever - drain the oil and save it. Refill with 5W, and then next summer use the 15W you saved. It won't hurt a thing to sit on the shelf for 6 months. Nice thing about this is that you won't have to wait a year to enjoy the huge difference that 5W makes in cold weather.
can u define a "hard" start for me, I mean it sounds pretty self explanatory,but does the truck do something in particular or does it just not start the first time. hopefully that's not a dumb a** question!
can u define a "hard" start for me, I mean it sounds pretty self explanatory,but does the truck do something in particular or does it just not start the first time. hopefully that's not a dumb a** question!
It's not a dumb question if you don't know the answer. A hard start will be when the engine sounds like it's missing. As it warms up (within moments of starting) it will start to sound normal as the oil warms up and flows easier through the engine...that's a hard start during cold temperatures. I don't remember what year your truck is...so not sure if you've got the block heater cord. If you've got it...plug the truck in and you won't have to worry about the oil being too think for cold starts (wouldn't have to worry about the 15W40 in your oil pan). Last winter I started my truck in SW Missouri one morning when the low had hit -13F and it wasn't plugged in. It started (took three cycles of the glow plugs) and it killed every flying thing for 2 miles...but it started. That'll learn me to not pay attention to the forecast.
can u define a "hard" start for me, I mean it sounds pretty self explanatory,but does the truck do something in particular or does it just not start the first time. hopefully that's not a dumb a** question!
As it relates to oil viscosity, I think a hard start would be some missing and stumbling and white smoke until the oil in the injectors warms up a little. That is where I noticed an immediate improvement with the 5W. It might be a longer crank time too. I did not notice any difference in cranking strength. It's all about the high pressure oil which powers the injection.
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