said by bemis:
Next oil change (which will be in early Spring) I will swap to 5W-20, I suppose I will have to supply the material to the mechanic to be sure he's using it. My guess is since he's an older-style local shop he just has the one weight in any quantity.
You're not doing yourself any favors by waiting until spring. The damage occurs when there is noise, even if it is just a small amount. I would have the *proper* oil installed as soon as practical.
And, you're being too easy on your shop. I owned "an older-styled local shop" for 18 years and stocked well over a dozen different oil weights and brands. 5W-20 isn't a new thing, it is very common.