Are these a trusty worthy engine? Are there rebuild kits availible? Do they accept turbo's very well? I found an 1982 Nissan pickup with the SD22. It doesnt run. Guy doesnt know if it runs. I am interested in buying it and going thru the engine and then running some biodiesel. Just curious how these compare to the toyota diesels of the same year as well as the mercedes 240D? I can pick the whole thing up for 500 bucks.