Bought some oil today!

[foggydogg]

I've been reading and I'm confused. So what is the best oil xxw-xx for P80 to use in the midwest?

Since I know for a fact I'm not smarter than the building full of engineers that designed these motors, I use what the owners manual calls out.
And if the outside temp gets anywhere near minus (F) numbers, both the car and I am staying inside.
If you want to go down the Geek hole,
https://bobistheoilguy.com/forums/

[MoVolvos]

Mobil 1 0W-40 was problematic in my 96R as well. I settled with 10W-40

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After figuring out it was the Mobil causing the head gasket leaks I stopped for years then the 0W-40. No Mobil for MoVolvo ever again.

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I'm not understanding how an oil would cause a blown headgasket.

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The detergent package in the earlier synthetics softened the headgasket material. Most head gaskets will have some form of metal reinforcement around the cylinder so it never leaks there but almost always out. No combustion pressure so no blown headgasket.

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