The car is a 1989 Camry 4-cyl automatic with 240k miles. Runs great and I’ve replaced every part on the car at least once in the ten years and 100k miles I’ve been driving it.

It’s using some oil, however. Not a great deal, but enough that we need to keep an eye on it. No smoking that we’re aware of at cold start or under way. It’s due for an oil change. Should I switch to a 40- or 50-weight oil? Climate is very mild, so cold weather is not an issue.

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Thoughts?