Gearbox oil is a definate no no.
What engine oil are you using now? eg 15W-40 etc.
Depending on how bad the noise is I can suggest going to HPR. When my old girl ute was on it's way out, I went to HPR 50 (Its like gearbox/diff oil!). Cured all the noises, no more using oil & withstood another 2 year's of abuse before the good engine was built.
The main reason was, it was cheap if you had to top it up all the time & the grades go from 30,40 & 50.
There are heaps of other oils out there, but for a worn out noisey engine & can recommend this.
http://penrite.com.au/html/s02_artic...&nav_top_id=55
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