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The one time I got lazy and took the 960 in for an oil change while I was still living in SoCal, the guy wanted to use 20w-50. In the 960 in January! When I told him to use 10w-30 he started arguing with me. They wouldn't "warentee" the work and made me sign a waver. They had already drained the oil and so I couldn't just take off and go somewhere else. I had to stand there and watch him to make sure he didn't use 20w-50.
Now I use Mobil 1 5w-40 in the 960 and 240 with 5k mile intervals year round. I live in the Bay Area so freezing weather is not an issue.
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