I need some advice, I bought a 91 land cruiser that was sitting for about 5 years outside. my mechanic got it running but said cylinder 5 has low compression and fears the engine may need a rebuild which he says is costly to say the least. He did however say he will try some marvel mystery oil and see if anything improves. Any advise on where to get a used engine, a swap, or a rebuild if I need it. I’m trying to remain on some what of a budget because there’s a long list of other stuff it needs. Thanks!!!!