Question about 1985 Ford Bronco II
I don't have an owners manual and do not know the best oil to use - 131,000 miles.
I used 20-50 in my Ford Bronco, because I had over 100,000 miles and the additional viscosity helped increase my horsepower and is much kinder to aging parts. I took it off road only occasionally. I have used higher viscosity on all of my cars over the years that have over 100,000 miles, and have always noticed marked improvement in performance and more longevity for my pistons. If you don't drive hard, and your car was previously treated very well, there's nothing wrong with a good non-synthetic 10-40 though. Some people mix a couple of bottles of 10-40 with a couple of bottles of 20-50. I just put four bottles of 20-50 in my 94 Thunderbird 4.6 litre V-8 yesterday.
Posted on Jun 21, 2009
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Posted on Jan 02, 2017
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