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Re: Oil Weight for 1985 Bronco II
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.
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20 w - 50 motor oil is a pretty heavy weight of a motor oil, normally engines either perform better on 5 w- 30, or 10 w - 30, if you have a owners manual , you can check in it to see what the manufacturer calls for , if you don't have a manual, then look on the oil cap, where you pour the oil into, it should have the information on the cap. there is even motor oils on the market specifically recommended for engines that have over 75,000 miles on them, one of them is valvoline max life. you will have to decide what kind that you want, thank you , and hope that this information has helped you.
If you drive normally then change your oil/filter every 5,000 miles. If you drive mostly city driving change it every 4,000 miles. If you drive mostly highway then change it every 6,000 miles. If you are using a synthetic oil then add 1,000 miles to each of these intervals. Use the correct weight oil for your 1997 MPV as listed in the owner's manual. Also use a quality filter such as Purolator, Wix, or Bosch. Change your air filter every 30,000 miles unless you drive in dusty conditions and then change it more often.
There's several answers to that question. The "best" oil is what the manufacturer recommends in the owner's manual. You can also make that decision based on several things including the type of driving you do, the temperature you most operate in, and personal preference. I have found that over the years simply using the recommended weight provides the best resutls.
Some folks use synthetic oil because they feel they get better performance. Personally I don't use synthetic oil in a car that didn't come from the factory with it. I've run several cars well over 200,000 miles by following the owner's manual without a hint of trouble.
Check the oil level in your transmission, I take it that it's a standard so your going to have to do it by removing the fill plug and felling for fluid. If it's low then you are losing transmission fluid though the front input shaft bearing and seal. Check the hydraulic clutch fluid, see if your losing some fluid there too, You may have a small leak bell housing.
Good luck and keep me posted.
I would change the oil to a premium synthetic such as Mobil 1 or Castrol. The oil weight should be what your owner's manual recommends. If you do have the owner's manual normal maintenance should be listed, otherwise do a search on the Internet. Using a good synthetic oil allows you to change oil and filter less frequently, say 5 to 10K miles. I change mine once per year unless I've done lots of city, stop and go driving. Nice car, glad you want to take care of it!