Just thought I'd add a comment - the original poster is a mate - still has the XTrail, but it has used a reasonable quantity of oil ever since the head went.....
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Ian X-1289(c)
2009 Platinum TL Xtrail - Scanguage2, Mio Moov360 GPS, Fridge, 100AH AGM 2nd battery, cargo barrier.
1998 GU Patrol 4.5 Petrol, lifted locked, barred...... so much there.