2 times in the last 2 weeks I my car has smoked & I'm not sure why. Car has a jdm engine so I'm not sure how many miles but it's been in for several years. Only thing that I've done recently is install an oem oil cooler & switch to rotella t6 from mobil 1 10w40 high mileage. This time I just put the whole 4 quarts in along with a wix filter. I have gotten a little noise on the first start of the day that lasts about a second. Car seems to be running healthy & boost fine however. It's not a massive amount of smoke or does it last very long. Today when it happened it seemed to be slightly more from the driver side exhaust & smells like oil. Any ideas?