What Uncle matt82dl says.
In times past, I've found that better, more reputable brands like MANN and, I think, WIX(?) were vendors to parts stores house brands.
That was like, in the 1990s, before all this made in Chinese junk crap and the fall of auto after market parts.
As for oil, you can get name brands as plain label or house brands. Like the NAPA house brand synthetic lubes is made by some reputable company. I'm not sure. Either Castrol, more likely, or, less likely, Mobil 1.
As your Volvo 240 engine wears with age, you won't harm it by moving to a heavier oil like a 10W40 or 15W40 in Summers. Clearances open up like the connecting rod bearing in the piston wrisp pin and journals.
You use a reputable brand like MANN that has that durable valve in it so the oil filter remains full of oil when you shut the hot engine off, and the hot oil remains in the filter and channels upward, so, when you start the engine next time, you shorten the ol pump time to build oil pressure back up.
If I had purchased that nearly new or new 1993 Volvo 240, I would use a quality synthetic from the get go with the OEM mandated oil filters. As the engines age and clearances open, again, try a heavier oil that is more viscous at the base weight in Summer, like a 15W40. In Winter, you may want to try a 10W40.
The modular Volvo engine built to exacting specifications mandate specific lubricant use.
I giving you anecdotal information. You may want to perform more research like at the API (American Petroleum Institute), the reputable engine oil and auto lubricant vendors, and the Volvo Web site as to what engine oils to use as that engine ages.
The API service specifications will always go up as lubricant research on mineral and synthetic lubricants never stops. The demand for a specific performance needed for a specific application in light industry, like your Volvo 240, or heavy industry, like capital projects in building hydroelectric dams (the equipment, the lubricant required in the generators) or mine site equipment. You can also thank NASA for seriously kicking off synthetic lubricant research on a larger scale.
Earl Grey tea fueled expository.
Welp, Happy Sat-Your-Day.
cheers.
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Duffings.
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