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Re: changing engine oil types from 10w30 to 5w30
If anything i would bump it up to a 10w40 with that kind of milage engine is prety loose, just stick with the same brand of oil just go heaver, i'am not a big fan of 5w30 to me its like pouring water in the crankcase.
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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.
100000 miles is really the life of engine.if oil light oil comes on check oil pressure it should be 30-80 psi at 3000 rpms.your oil pump is in front timing cover.you have to remove the crankshaft damper.you will need a haynes manual .because you going to have remove timing belt.the manual will help you locate timing marks.