Just bought an '87 YJ. Need to change the oil soon. Does anyone know what type of oil and weight I should use??? Synthetic or Not??? It has 171K miles and it is used for around town as well as highway miles. Thanks.
I know that it is the original Inline L-6 engine. I believe it is a 4.2 Liter. I am not sure if synthetic oil or regular was used. Will it hurt the engine if I decide to go synthetic??? Not sure the type of oil the previous owner put in. I do not want to hurt the engine by going back to regular if he used synthetic. Thanks.
good ole 10w30. don't worry about synthetic, even if it was in there, its a myth that its bad to go back.
i also use valvoline max life, you could also go w/ 10w40 without a problem also.
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