I'm using Penetrol, which contains a lot of linseed oil, to protect some metal on my '64 Microbus. What is the best thing to thin it out a bit?  I'd like to  enhance its sprayability and make sure it creeps into crevices and rust pores. 

I've used Gibbs oil in the past, and it's good but a bit too expensive. 

Thanks,

Chris. 

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