yeah you need to change your oil a lot more often, and keep your cooling system in good shape. if you want your engine to last even longer, run premix. properly maintained they can last a very long time upwards of 300k. imporperly maintained, they might give out at 100. the catch is you never really know how well the previous owner maintained it. they also dont like to sit for long periods of time. redlining it every so often is important too, since it helps to get rid of carbon buildup